Merge branch 'worktree-agent-a7281df1f2cc3f1f1'

# Conflicts: # gerbil-manager-web/src/genetics/catalog.ts # gerbil-manager-web/src/genetics/genotype.ts # gerbil-manager-web/src/genetics/punnett.ts
2026-06-23 09:29:42 +02:00
parent a87d1ec865 8c1ee75b81
commit 0540498e85
15 changed files with 2147 additions and 164 deletions
--- a/GerbilManagerWebAPI/ApplicationContext.cs
+++ b/GerbilManagerWebAPI/ApplicationContext.cs
@@ -400,25 +400,28 @@ public class ApplicationContext : DbContext
            ("Dilute Anthrazit",   "aa CC dd EE gg PP spsp rere", 31),
            // --- Schimmel / Fuchsschimmel (IDs 33-37) ---
            ("Silberschimmel",      "AA CC DD efef gg PP spsp rere", 36),
-            ("Polarfuchsschimmel",  "AA CC DD efef gg PP spsp rere", 37),
-            ("Algierfuchsschimmel", "AA CC DD efef GG PP spsp rere", 38),
-            ("Kohlfuchsschimmel",   "aa CC DD efef GG PP spsp rere", 39),
-            ("Blaufuchsschimmel",   "aa CC DD efef gg PP spsp rere", 40),
+            // GEN-5 (ticket 5826e8e2): *Fuchsschimmel = HET ef/e (internal 'efe'),
+            // not hom ef/ef — a Schimmel-modified Fox. Pure *schimmel stay efef.
+            ("Polarfuchsschimmel",  "AA CC DD efe gg PP spsp rere", 37),
+            ("Algierfuchsschimmel", "AA CC DD efe GG PP spsp rere", 38),
+            ("Kohlfuchsschimmel",   "aa CC DD efe GG PP spsp rere", 39),
+            ("Blaufuchsschimmel",   "aa CC DD efe gg PP spsp rere", 40),
            // --- Hell variants (IDs 38-48) ---
            ("Kohlfuchs, hell",      "aa CC DD ee GG PP spsp rere", 41),
            ("Goldfuchs, hell",      "AA CC DD ee GG pp spsp rere", 42),
-            ("Goldfuchsschimmel",    "AA CC DD efef GG pp spsp rere", 43),
+            ("Goldfuchsschimmel",    "AA CC DD efe GG pp spsp rere", 43),
            ("Gold-Hell",            "AA CC DD EE GG pp spsp rere", 44),
            ("Blaufuchs, hell",      "aa CC DD ee gg PP spsp rere", 45),
-            ("Rotfuchsschimmel",     "aa CC DD efef GG pp spsp rere", 46),
+            ("Rotfuchsschimmel",     "aa CC DD efe GG pp spsp rere", 46),
            ("Polarfuchs, hell",     "AA CC DD ee gg PP spsp rere", 47),
-            ("Kohlfuchsschimmel, hell","aa CC DD efef GG PP spsp rere", 48),
+            ("Kohlfuchsschimmel, hell","aa CC DD efe GG PP spsp rere", 48),
            ("Rotfuchs, hell",       "aa CC DD ee GG pp spsp rere", 49),
            ("Kohlfuchs-Hell",       "aa CC DD ee GG PP spsp rere", 50),
            ("Algierfuchs, hell",    "AA CC DD ee GG PP spsp rere", 51),
            // --- Dilute (dd) renamed variants (IDs 49-50) ---
            ("Dilute Topas",   "AA CC dd EE GG pp spsp rere", 52),
-            ("Dilute Blaufuchs","aa CC dd ee gg pp spsp rere", 53),
+            // GEN-5 (ticket 3deab547): Blaufuchs is black-eyed; dilution is P-independent.
+            ("Dilute Blaufuchs","aa CC dd ee gg PP spsp rere", 53),
            // --- Marder / Siam / CP- series (IDs 51-66) ---
            ("Marder",    "aa cchmcchm DD EE GG PP spsp rere", 54),
            ("Siam",      "aa cchmch DD EE GG PP spsp rere",   55),
--- a/GerbilManagerWebAPI/Migrations/20260623065520_Gen5FuchsschimmelHetSeedFix.Designer.cs
+++ b/GerbilManagerWebAPI/Migrations/20260623065520_Gen5FuchsschimmelHetSeedFix.Designer.cs
--- a/GerbilManagerWebAPI/Migrations/20260623065520_Gen5FuchsschimmelHetSeedFix.cs
+++ b/GerbilManagerWebAPI/Migrations/20260623065520_Gen5FuchsschimmelHetSeedFix.cs
@@ -0,0 +1,131 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace GerbilManagerWebAPI.Migrations
+{
+    /// <inheritdoc />
+    public partial class Gen5FuchsschimmelHetSeedFix : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000034"),
+                column: "CanonicalGenotype",
+                value: "AA CC DD efe gg PP spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000035"),
+                column: "CanonicalGenotype",
+                value: "AA CC DD efe GG PP spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000036"),
+                column: "CanonicalGenotype",
+                value: "aa CC DD efe GG PP spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000037"),
+                column: "CanonicalGenotype",
+                value: "aa CC DD efe gg PP spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000040"),
+                column: "CanonicalGenotype",
+                value: "AA CC DD efe GG pp spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000043"),
+                column: "CanonicalGenotype",
+                value: "aa CC DD efe GG pp spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000045"),
+                column: "CanonicalGenotype",
+                value: "aa CC DD efe GG PP spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000050"),
+                column: "CanonicalGenotype",
+                value: "aa CC dd ee gg PP spsp rere");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000034"),
+                column: "CanonicalGenotype",
+                value: "AA CC DD efef gg PP spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000035"),
+                column: "CanonicalGenotype",
+                value: "AA CC DD efef GG PP spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000036"),
+                column: "CanonicalGenotype",
+                value: "aa CC DD efef GG PP spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000037"),
+                column: "CanonicalGenotype",
+                value: "aa CC DD efef gg PP spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000040"),
+                column: "CanonicalGenotype",
+                value: "AA CC DD efef GG pp spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000043"),
+                column: "CanonicalGenotype",
+                value: "aa CC DD efef GG pp spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000045"),
+                column: "CanonicalGenotype",
+                value: "aa CC DD efef GG PP spsp rere");
+
+            migrationBuilder.UpdateData(
+                table: "ColorVarieties",
+                keyColumn: "Id",
+                keyValue: new Guid("00000000-0000-0000-0000-000000000050"),
+                column: "CanonicalGenotype",
+                value: "aa CC dd ee gg pp spsp rere");
+        }
+    }
+}
--- a/GerbilManagerWebAPI/Migrations/ApplicationContextModelSnapshot.cs
+++ b/GerbilManagerWebAPI/Migrations/ApplicationContextModelSnapshot.cs
@@ -483,28 +483,28 @@ namespace GerbilManagerWebAPI.Migrations
                        new
                        {
                            Id = new Guid("00000000-0000-0000-0000-000000000034"),
-                            CanonicalGenotype = "AA CC DD efef gg PP spsp rere",
+                            CanonicalGenotype = "AA CC DD efe gg PP spsp rere",
                            Name = "Polarfuchsschimmel",
                            SortOrder = 37
                        },
                        new
                        {
                            Id = new Guid("00000000-0000-0000-0000-000000000035"),
-                            CanonicalGenotype = "AA CC DD efef GG PP spsp rere",
+                            CanonicalGenotype = "AA CC DD efe GG PP spsp rere",
                            Name = "Algierfuchsschimmel",
                            SortOrder = 38
                        },
                        new
                        {
                            Id = new Guid("00000000-0000-0000-0000-000000000036"),
-                            CanonicalGenotype = "aa CC DD efef GG PP spsp rere",
+                            CanonicalGenotype = "aa CC DD efe GG PP spsp rere",
                            Name = "Kohlfuchsschimmel",
                            SortOrder = 39
                        },
                        new
                        {
                            Id = new Guid("00000000-0000-0000-0000-000000000037"),
-                            CanonicalGenotype = "aa CC DD efef gg PP spsp rere",
+                            CanonicalGenotype = "aa CC DD efe gg PP spsp rere",
                            Name = "Blaufuchsschimmel",
                            SortOrder = 40
                        },
@@ -525,7 +525,7 @@ namespace GerbilManagerWebAPI.Migrations
                        new
                        {
                            Id = new Guid("00000000-0000-0000-0000-000000000040"),
-                            CanonicalGenotype = "AA CC DD efef GG pp spsp rere",
+                            CanonicalGenotype = "AA CC DD efe GG pp spsp rere",
                            Name = "Goldfuchsschimmel",
                            SortOrder = 43
                        },
@@ -546,7 +546,7 @@ namespace GerbilManagerWebAPI.Migrations
                        new
                        {
                            Id = new Guid("00000000-0000-0000-0000-000000000043"),
-                            CanonicalGenotype = "aa CC DD efef GG pp spsp rere",
+                            CanonicalGenotype = "aa CC DD efe GG pp spsp rere",
                            Name = "Rotfuchsschimmel",
                            SortOrder = 46
                        },
@@ -560,7 +560,7 @@ namespace GerbilManagerWebAPI.Migrations
                        new
                        {
                            Id = new Guid("00000000-0000-0000-0000-000000000045"),
-                            CanonicalGenotype = "aa CC DD efef GG PP spsp rere",
+                            CanonicalGenotype = "aa CC DD efe GG PP spsp rere",
                            Name = "Kohlfuchsschimmel, hell",
                            SortOrder = 48
                        },
@@ -595,7 +595,7 @@ namespace GerbilManagerWebAPI.Migrations
                        new
                        {
                            Id = new Guid("00000000-0000-0000-0000-000000000050"),
-                            CanonicalGenotype = "aa CC dd ee gg pp spsp rere",
+                            CanonicalGenotype = "aa CC dd ee gg PP spsp rere",
                            Name = "Dilute Blaufuchs",
                            SortOrder = 53
                        },
--- a/gerbil-manager-web/src/genetics/tests/genetics.test.ts
+++ b/gerbil-manager-web/src/genetics/tests/genetics.test.ts
@@ -17,6 +17,8 @@ import {
  wildType,
  extractGenotypeFlags,
  displayGenotypeSafe,
+  resolveAllelePair,
+  inferUnknownsFromParents,
 } from '../genotype'
 import { combineLocus } from '../punnett'
 import { LOCI, type LocusKey } from '../loci'
@@ -239,10 +241,11 @@ describe('Farbschlag catalog', () => {
 })

 describe('Partially-unknown parents (wildcards)', () => {
-  it('handles an A? parent (phenotype agouti, genotype unknown)', () => {
-    // A? x aa at the A locus -> father gamete: 1/2 A, 1/4 (each of A,a) from "?"
-    //   = effectively 3/4 A, 1/4 a ; mother always a.
-    // Offspring: 3/4 Aa, 1/4 aa.
+  it('GEN-5: an A? parent reads as AA (unknown copies the known allele)', () => {
+    // GEN-5 (ticket 3e643ef1, breeder rule): the unknown allele '?' is a COPY of
+    // the known partner 'A', so A? = AA. AA × aa → all Aa → 100% Agouti.
+    // (Previously '?' spread uniformly → 3/4 Agouti : 1/4 Schwarz, which invented
+    // a recessive 'a' gamete the parent demonstrably does not show.)
    const father = makeGenotype({
      A: ['A', '?'],
      C: ['C', 'C'],
@@ -257,10 +260,10 @@ describe('Partially-unknown parents (wildcards)', () => {
    const mother = fromDisplayString('aa CC DD EE GG PP spsp rere')
    const result = breed(father, mother)

-    const agouti = result.byFarbschlag.find((f) => f.farbschlag === 'Agouti')!
-    const schwarz = result.byFarbschlag.find((f) => f.farbschlag === 'Schwarz')!
-    expect(agouti.probability.text).toBe('3/4')
-    expect(schwarz.probability.text).toBe('1/4')
+    expect(result.offspring).toHaveLength(1)
+    expect(result.offspring[0].farbschlag).toBe('Agouti')
+    expect(result.offspring[0].probability.text).toBe('1')
+    expect(result.byFarbschlag.some((f) => f.farbschlag === 'Schwarz')).toBe(false)
  })
 })

@@ -603,7 +606,10 @@ describe('GEN-4: Dilute prefix, REW, no-bare-Fuchs', () => {
    expect(name('AA CC dd EE GG PP spsp rere')).toBe('Dilute Agouti')
    expect(name('aa CC dd EE gg PP spsp rere')).toBe('Dilute Anthrazit')
    expect(name('aa CC dd ee GG PP spsp rere')).toBe('Dilute Kohlfuchs')
-    expect(name('aa CC dd ee gg pp spsp rere')).toBe('Dilute Blaufuchs')
+    // GEN-5 (ticket 3deab547): Blaufuchs is BLACK-eyed (P), and dilution is
+    // independent of the P-locus, so Dilute Blaufuchs is aa dd ee gg P- (was
+    // wrongly P:'p'). The pink-eyed variant is a different (REW-adjacent) colour.
+    expect(name('aa CC dd ee gg PP spsp rere')).toBe('Dilute Blaufuchs')
    expect(name('AA CC dd EE GG pp spsp rere')).toBe('Dilute Gold')
    expect(name('aa CC dd EE GG pp spsp rere')).toBe('Dilute Platin')
  })
@@ -628,10 +634,13 @@ describe('GEN-4: Dilute prefix, REW, no-bare-Fuchs', () => {

  it('Farbarten (categories) never appear as computed results', () => {
    // 'Fuchs', 'Fuchsschimmel', 'Schimmel' etc. are Farbarten — blocked by category guard.
-    // het ef/e now resolves to specific variety via locusToken ef/e -> 'ef' fix.
+    // GEN-5 (ticket 5826e8e2): het ef/e is the FUCHSSCHIMMEL family — it resolves to
+    // a *fuchsschimmel variety, NEVER a pure Schimmel (Rotaugen-/Orangeschimmel).
    expect(genotypeToFarbschlag(fromDisplayString('aa CC DD eef GG PP spsp rere'))).toBe('Kohlfuchsschimmel')
-    // Agouti ef/e: 'Orangeschimmel' wins (same token-set as Algierfuchsschimmel, listed first)
-    expect(genotypeToFarbschlag(fromDisplayString('AA CC DD eef GG PP spsp rere'))).toBe('Orangeschimmel')
+    // Agouti ef/e black-eyed → Algierfuchsschimmel (A:A,E:ef,G:G,P:P), NOT Orangeschimmel.
+    expect(genotypeToFarbschlag(fromDisplayString('AA CC DD eef GG PP spsp rere'))).toBe('Algierfuchsschimmel')
+    // hom ef/ef agouti black-eyed → the pure Orangeschimmel (Schimmel family).
+    expect(genotypeToFarbschlag(fromDisplayString('AA CC DD efef GG PP spsp rere'))).toBe('Orangeschimmel')
    // Unusual combo not in catalog -> Unbekannt (not 'Fuchsschimmel')
    expect(farbschlagFor(fromDisplayString('aa CC dd eef GG PP spsp rere')).unknown).toBe(true)
    // FK check: none of the 7 category names are in BASE_COLORS (no DB entries -> no FK risk)
@@ -789,3 +798,118 @@ describe('GEN-3h: breeder bracket-notation display + E-locus e-before-ef order',
    expect(displayGenotypeSafe('')).toBe('')
  })
 })
+
+describe('GEN-5: unknown allele = copy of known (resolveAllelePair, breeder rule)', () => {
+  it('a single-unknown pair resolves to the homozygote of the KNOWN allele', () => {
+    expect(resolveAllelePair('A', ['A', '?'])).toEqual(['A', 'A'])
+    expect(resolveAllelePair('A', ['?', 'a'])).toEqual(['a', 'a'])
+    expect(resolveAllelePair('D', ['D', '?'])).toEqual(['D', 'D'])
+    expect(resolveAllelePair('E', ['e', '?'])).toEqual(['e', 'e']) // ee[-] = Fuchs
+    expect(resolveAllelePair('E', ['ef', '?'])).toEqual(['ef', 'ef']) // ef[-] = Schimmel
+  })
+  it('a fully-unknown pair falls back to wild-type (markers stay unmarked)', () => {
+    expect(resolveAllelePair('A', ['?', '?'])).toEqual(['A', 'A'])
+    expect(resolveAllelePair('C', ['?', '?'])).toEqual(['C', 'C'])
+    expect(resolveAllelePair('Sp', ['?', '?'])).toEqual(['sp', 'sp']) // never implies Schecke
+  })
+  it('a fully-known pair is returned unchanged', () => {
+    expect(resolveAllelePair('C', ['C', 'ch'])).toEqual(['C', 'ch'])
+  })
+})
+
+describe('GEN-5: genetics-engine ticket reproductions (real stored genotypes)', () => {
+  const name = (s: string) => genotypeToFarbschlag(fromDisplayString(s))
+
+  it('5826e8e2: ee[f] het (Fuchsschimmel) + pp → Goldfuchsschimmel, NOT Rotaugenschimmel', () => {
+    // Tier bf6f4507: Aa C- D- ee[f] G- pp Spsp — het ef/e is a Fuchsschimmel.
+    expect(name('Aa C- D- ee[f] G- pp Spsp')).toBe('Goldfuchsschimmel Schecke')
+    // and the pure hom ef/ef pp stays the pure Schimmel:
+    expect(name('AA CC DD efef GG pp spsp')).toBe('Rotaugenschimmel')
+  })
+
+  it('b034ddd2: ee[-] (e + unknown) → ee Fuchs → Algierfuchs, NOT Agouti', () => {
+    // Tier 33a7c1f9: Aa CC D- ee[-] Gg Pp spsp. Old engine read [e,?] as e/E → Agouti.
+    expect(name('Aa CC D- ee[-] Gg Pp spsp')).toBe('Algierfuchs')
+  })
+
+  it('3deab547 / efa2b232: aa cchm dd ee[-] gg P- → Dilute CP-Blaufuchs, NOT Zobel/blau/Unbekannt', () => {
+    // Tier 6864eaef. Non-agouti Fuchs colourpoint is NOT a marten (Zobel) — it
+    // derives a CP-fox base with the Dilute prefix.
+    expect(name('aa c[chm]c[chm] dd ee[-] gg Pp Spsp')).toBe('Dilute CP-Blaufuchs Schecke')
+  })
+
+  it('473dc345 / 5151ab20: Vance uw[d] (dense underwhite) parses (no crash) → Kohlfuchs', () => {
+    // Tier f31eb1f9: aa Cc[chm] D- ee Uwuw[d] PP spsp. uw[d] is the G locus;
+    // it must parse and NEVER render 'uw'.
+    const g = fromDisplayString('aa Cc[chm] D- ee Uwuw[d] PP spsp')
+    expect(g.G).toEqual(['G', 'g'])
+    expect(toDisplayString(g)).not.toContain('uw')
+    expect(genotypeToFarbschlag(g)).toBe('Kohlfuchs')
+  })
+
+  it('Fuchsschimmel family never resolves to a pure Schimmel variety', () => {
+    // Agouti het ef/e black-eyed → Algierfuchsschimmel; hom ef/ef → Orangeschimmel.
+    expect(name('AA CC DD eef GG PP spsp')).toBe('Algierfuchsschimmel')
+    expect(name('AA CC DD efef GG PP spsp')).toBe('Orangeschimmel')
+  })
+})
+
+describe('GEN-5: no phantom colours in the expected-litter list (3e643ef1/c8ce27e2/3c46d0b4/1e7b66e6)', () => {
+  it('Mamta Mini (D-, Ee[-]) × Gold (D-, Ee): unknown D copies known D → no Dilute, no Unbekannt, no efef', () => {
+    // Real litter 98bfdf92. Both parents carry D- (unknown D) and an unknown E
+    // partner. The old uniform-spread invented dd / ef / 'Unbekannt' offspring.
+    const father = fromDisplayString('AA CC D- Ee[-] Gg PP spsp') // Mamta Mini
+    const mother = fromDisplayString('Aa CC D- Ee Gg pp spsp') // Gold
+    const result = breed(father, mother)
+
+    const names = result.byFarbschlag.map((f) => f.farbschlag)
+    expect(names).not.toContain('Unbekannter Farbschlag')
+    expect(names.some((n) => n.startsWith('Dilute'))).toBe(false)
+    expect(result.offspring.every((o) => !o.genotype.includes('e[f]'))).toBe(true)
+    // Probabilities still sum to exactly 1.
+    const sum = result.offspring.reduce((acc, o) => acc + o.probability.value, 0)
+    expect(sum).toBeCloseTo(1, 10)
+    // Only agouti vs silver-agouti can fall here (G locus segregates; everything else fixed).
+    expect(new Set(names)).toEqual(new Set(['Agouti', 'Silberagouti']))
+  })
+
+  it('D- × D- never yields a dd (dilute) offspring at all', () => {
+    const p = fromDisplayString('AA CC D- EE GG PP spsp')
+    const result = breed(p, p)
+    expect(result.offspring.every((o) => !o.genotype.includes('dd'))).toBe(true)
+  })
+})
+
+describe('GEN-5: parent inference fills unknown alleles (cc9ea3fe / 1a508c04)', () => {
+  it('Mamta Mini Ee[-] + homozygous ee father Geely → Ee', () => {
+    const child = fromDisplayString('AA CC DD Ee[-] Gg PP spsp')
+    const geely = fromDisplayString('aa CC DD ee gg PP spsp') // father: ee (hom fox)
+    const res = inferUnknownsFromParents(child, geely, null)
+    expect(res.genotype.E).toEqual(['E', 'e'])
+    expect(toDisplayString(res.genotype)).toBe('AA CC DD Ee Gg PP spsp')
+    expect(res.inferred).toEqual([{ locus: 'E', allele: 'e', from: 'father' }])
+  })
+
+  it('falls back to the mother when only she is homozygous', () => {
+    const child = fromDisplayString('AA CC DD Ee[-] GG PP spsp')
+    const father = fromDisplayString('AA CC DD Ee GG PP spsp') // het → no force
+    const mother = fromDisplayString('aa CC DD ee GG PP spsp') // ee → forces e
+    const res = inferUnknownsFromParents(child, father, mother)
+    expect(res.genotype.E).toEqual(['E', 'e'])
+    expect(res.inferred).toEqual([{ locus: 'E', allele: 'e', from: 'mother' }])
+  })
+
+  it('leaves the genotype untouched when no parent is homozygous at the unknown locus', () => {
+    const child = fromDisplayString('AA CC DD Ee[-] GG PP spsp')
+    const father = fromDisplayString('AA CC DD Ee GG PP spsp')
+    const res = inferUnknownsFromParents(child, father, null)
+    expect(res.inferred).toEqual([])
+    expect(res.genotype.E).toEqual(child.E)
+  })
+
+  it('no-op when there is nothing unknown', () => {
+    const child = fromDisplayString('AA CC DD Ee GG PP spsp')
+    const res = inferUnknownsFromParents(child, child, child)
+    expect(res.inferred).toEqual([])
+  })
+})
--- a/gerbil-manager-web/src/genetics/catalog.ts
+++ b/gerbil-manager-web/src/genetics/catalog.ts
@@ -20,12 +20,12 @@
 *    meta rows dropped, 17 matched the frozen names). Genotypes normalized from
 *    portal notation (c[chm]->cchm, c[h]->ch, e[f]->ef, '-'/'--' = unknown).
 */
-import { LOCI, LOCUS_ORDER, dominantAllele, type LocusKey } from './loci'
+import { LOCUS_ORDER, dominantAllele, type LocusKey } from './loci'
 import {
  makeGenotype,
+  resolveAllelePair,
  toDisplayString,
  wildType,
-  WILDCARD,
  type AllelePair,
  type Genotype,
 } from './genotype'
@@ -113,7 +113,11 @@ export const BASE_COLORS: readonly FarbschlagEntry[] = [
  { name: 'Kohlfuchs-Hell', tokens: { A: 'a', C: 'C', D: 'D', E: 'e', G: 'G', P: 'P' }, image: 'kohlfuchs-hell-2.jpg' },
  { name: 'Algierfuchs, hell', tokens: { A: 'A', C: 'C', D: 'D', E: 'e', G: 'G', P: 'P' }, image: 'algierfuchs-hell.JPG' },
  { name: 'Dilute Topas', tokens: { A: 'A', C: 'C', D: 'd', E: 'E', G: 'G', P: 'p' }, image: 'topas-dd.jpg' },
-  { name: 'Dilute Blaufuchs', tokens: { A: 'a', C: 'C', D: 'd', E: 'e', G: 'g', P: 'p' }, image: 'blaufuchs-dd.jpg' },
+  // GEN-5 (ticket 3deab547): Blaufuchs is black-eyed (P, line 75); dilution dd is
+  // independent of the eye-pigment P-locus, so the dilute form is ALSO P:'P'
+  // (was P:'p', which made it an unreachable phantom and left dd CP-fox animals
+  // 'Unbekannt'/'blau'). Now aa cchm dd ee gg P- → 'Dilute CP-Blaufuchs'.
+  { name: 'Dilute Blaufuchs', tokens: { A: 'a', C: 'C', D: 'd', E: 'e', G: 'g', P: 'P' }, image: 'blaufuchs-dd.jpg' },

  // ── GEN-3f/3g: c^chm colourpoint varieties ──
  // GEN-3f: aa points = marten/sable group (Marder/Siam, +gg Zobel/Zobel-Hell).
@@ -163,13 +167,10 @@ export interface FarbschlagMatch {
 * variety specifically.
 */
 function locusToken(g: Genotype, locus: LocusKey): string {
-  // Default an unknown allele to the WILD-TYPE reading: most-dominant for the
-  // colour loci (unknown-C => full-colour 'C', not a white), but the recessive
-  // UNMARKED allele for the spotting/rex markers (unknown-Sp must NOT imply Schecke).
-  const alleles = LOCI[locus].alleles
-  const isMarker = locus === 'Sp' || locus === 'Re' || locus === 'Sls'
-  const fallback = isMarker ? alleles[alleles.length - 1] : alleles[0]
-  const [x, y] = g[locus].map((a) => (a === WILDCARD ? fallback : a))
+  // GEN-5: an unknown allele is a COPY of the known partner (resolveAllelePair),
+  // so e.g. [e,?] reads as ee (Fuchs), NOT e/E. Only a fully-unknown locus falls
+  // back to the wild-type reading (most-dominant colour / unmarked marker).
+  const [x, y] = resolveAllelePair(locus, g[locus])
  if (locus === 'E') {
    if (x === y) return x // ee->'e', efef->'ef', EE->'E'
    // GEN-4: het ef/e → 'ef' (ef is dominant for the Schimmel phenotype;
@@ -195,29 +196,50 @@ function matches(g: Genotype, entry: FarbschlagEntry): boolean {
 * computed farbschlag output (the farbschlagFor category guard blocks them).
 */
 function eFamily(g: Genotype): string | null {
-  const [x, y] = g.E
+  // GEN-5: resolve unknown E as a copy of the known allele first ([e,?]→ee Fuchs,
+  // [ef,?]→ef/ef Schimmel, [E,?]→EE full), so families are decided consistently.
+  const [x, y] = resolveAllelePair('E', g.E)
  if (x === 'e' && y === 'e') return 'Fuchs'
  if ((x === 'e' && y === 'ef') || (x === 'ef' && y === 'e')) return 'Fuchsschimmel'
  if (x === 'ef' && y === 'ef') return 'Schimmel'
-  if ((x === 'e' || y === 'e') && (x === WILDCARD || y === WILDCARD)) return 'Fuchs'
  return null
 }

 /** Resolve a genotype to its German Farbschlag (with Schecke/Rex modifiers). */
-/** Resolve an allele pair to concrete alleles, defaulting unknown to wild-type. */
+/**
+ * Resolve an allele pair to concrete alleles. GEN-5: an unknown allele copies the
+ * known partner (resolveAllelePair); a fully-unknown locus falls back to wild-type.
+ */
 function resolvedPair(g: Genotype, locus: LocusKey): [string, string] {
-  const alleles = LOCI[locus].alleles
-  const isMarker = locus === 'Sp' || locus === 'Re' || locus === 'Sls'
-  const fallback = isMarker ? alleles[alleles.length - 1] : alleles[0]
-  const [x, y] = g[locus].map((a) => (a === WILDCARD ? fallback : a))
-  return [x, y]
+  return resolveAllelePair(locus, g[locus])
+}
+
+/**
+ * Whether a catalog entry belongs to the given E-family by NAME. The Schimmel
+ * entries split into two breeder groups that share the same E:'ef' token but
+ * differ by zygosity of the live animal:
+ *   - 'Fuchsschimmel' family (ef/e het) → only *fuchsschimmel entries
+ *     (Goldfuchsschimmel, Kohlfuchsschimmel, …).
+ *   - 'Schimmel' family (ef/ef hom)     → the pure roan entries whose name ends
+ *     in 'schimmel' but NOT 'fuchsschimmel' (Rotaugenschimmel, Orangeschimmel,
+ *     Silberschimmel, …).
+ * GEN-5 (ticket 5826e8e2): this is why ef/e must NOT match a pure-Schimmel entry
+ * (Rotaugenschimmel) — a het Fuchsschimmel animal is a Goldfuchsschimmel.
+ */
+function entryInEFamily(entry: FarbschlagEntry, family: string): boolean {
+  if (entry.tokens.E === undefined) return false
+  const n = entry.name.toLowerCase()
+  if (family === 'Fuchsschimmel') return n.includes('fuchsschimmel')
+  if (family === 'Schimmel') return n.includes('schimmel') && !n.includes('fuchsschimmel')
+  // 'Fuchs' family: fox entries are E:'e' (no 'schimmel' in the name).
+  return !n.includes('schimmel')
 }

 /** Base colour name (no modifiers, no colourpoint prefix), via E-family + matches. */
 function baseColourFor(g: Genotype): string | null {
  const family = eFamily(g)
  const base = family
-    ? (BASE_COLORS.find((e) => e.tokens.E !== undefined && matches(g, e)) ?? null)
+    ? (BASE_COLORS.find((e) => entryInEFamily(e, family) && matches(g, e)) ?? null)
    : (BASE_COLORS.find((e) => matches(g, e)) ?? null)
  // GEN-4: never fall back to the family name — Fuchs/Fuchsschimmel/Schimmel are
  // Farbarten (categories), not concrete Farbschläge.  If no catalog entry matches,
@@ -242,32 +264,20 @@ function colourpointName(g: Genotype): string | null {
  // Remaining: cchm/cchm or cchm/ch (colourpoint, no full C, not chch).
  const bothCchm = c[0] === 'cchm' && c[1] === 'cchm'
  const agouti = resolvedPair(g, 'A').includes('A')
-  if (!agouti) {
-    // #3: the aa colourpoint branch must respect D (dilute) and E (Fuchs/Schimmel)
-    // instead of hard-coding Marder/Siam/Zobel. The frozen breeder names
-    // Marder/Siam/Zobel/Zobel-Hell only describe the wild D + full-extension case
-    // (aa cchm DD EE [gg]); they are kept for that case. Any non-wild D or E (e.g.
-    // dd dilute or ee Fuchs) is named from the resolved base colour, so
-    // 'aa cchm dd ee gg' no longer collapses to Zobel.
-    const [d1, d2] = resolvedPair(g, 'D')
-    const wildD = d1 === 'D' && d2 === 'D'
-    const fullExtension = eFamily(g) === null // E expresses full 'E' (not Fuchs/Schimmel)
-    if (wildD && fullExtension) {
-      const [g1, g2] = resolvedPair(g, 'G')
-      const grey = g1 === 'g' && g2 === 'g'
-      if (grey) return bothCchm ? 'Zobel' : 'Zobel-Hell'
-      return bothCchm ? 'Marder' : 'Siam'
-    }
-    // dilute and/or Fuchs/Schimmel aa colourpoint → derive from the base colour.
-    const base = baseColourFor(makeGenotype({ ...g, C: ['C', 'C'] }))
-    if (!base) return null
-    const DILUTE = 'Dilute '
-    if (base.startsWith(DILUTE)) {
-      return `${DILUTE}CP-${base.slice(DILUTE.length)}${bothCchm ? '' : '-Hell'}`
-    }
-    return `CP-${base}${bothCchm ? '' : '-Hell'}`
+  // GEN-5 (tickets 3deab547 / efa2b232): the aa marten names (Marder/Siam/Zobel/
+  // Zobel-Hell) are FULL-EXTENSION (E) sable varieties only. A non-agouti
+  // colourpoint that is Fuchs (ee) or Schimmel (ef) is NOT a Marder/Zobel — it
+  // must derive its base generically like the A- branch, so e.g.
+  // aa cchm dd ee gg → 'Dilute CP-Polarfuchs' (dilute + fox + grey), never Zobel.
+  if (!agouti && eFamily(g) === null) {
+    const [g1, g2] = resolvedPair(g, 'G')
+    const grey = g1 === 'g' && g2 === 'g'
+    if (grey) return bothCchm ? 'Zobel' : 'Zobel-Hell'
+    return bothCchm ? 'Marder' : 'Siam'
  }
-  // A- colourpoint: base as if C were full; het (cchm/ch) -> '-Hell' suffix.
+  // Colourpoint base derivation: name the colour as if C were full, then prefix
+  // 'CP-'; het (cchm/ch) gets the '-Hell' suffix. Used by A- and by non-agouti
+  // Fuchs/Schimmel colourpoints (which have no dedicated marten name).
  const base = baseColourFor(makeGenotype({ ...g, C: ['C', 'C'] }))
  if (!base) return null
  // GEN-4: if base is a Dilute variety, prefix ordering is 'Dilute CP-X' not 'CP-Dilute X'.
@@ -333,12 +343,22 @@ export function genotypeToFarbschlag(g: Genotype): string {
 export function representativeGenotype(entry: FarbschlagEntry): Genotype {
  const base = wildType()
  const out = {} as Record<LocusKey, AllelePair>
+  // GEN-5 (ticket 5826e8e2): a *Fuchsschimmel variety is the HETEROZYGOUS ef/e
+  // animal (a Schimmel-modified Fox), whereas the pure *schimmel varieties
+  // (Rotaugen-/Orange-/Silberschimmel) are HOMOZYGOUS ef/ef. The E token is the
+  // shared phenotype letter 'ef'; the representative genotype must encode the
+  // right zygosity so each entry round-trips back to its own family.
+  const isFuchsschimmel = entry.name.toLowerCase().includes('fuchsschimmel')
  for (const locus of LOCUS_ORDER) {
    const token = entry.tokens[locus]
    if (!token) {
      out[locus] = base[locus]
      continue
    }
+    if (locus === 'E' && token === 'ef' && isFuchsschimmel) {
+      out[locus] = ['ef', 'e'] // het Fuchsschimmel (ef/e), not hom ef/ef
+      continue
+    }
    // GEN-3f: a token may encode a HETEROZYGOUS pair as "x/y" (e.g. the het
    // colourpoints Siam/Zobel-Hell use C: 'cchm/ch'); otherwise it's homozygous.
    const [a, b] = token.includes('/') ? (token.split('/') as [string, string]) : [token, token]
--- a/gerbil-manager-web/src/genetics/colorVarietySeed.backend.json
+++ b/gerbil-manager-web/src/genetics/colorVarietySeed.backend.json
@@ -236,25 +236,25 @@
  },
  {
    "name": "Polarfuchsschimmel",
-    "canonicalGenotype": "AA CC DD efef gg PP spsp rere",
+    "canonicalGenotype": "AA CC DD efe gg PP spsp rere",
    "sortOrder": 37,
    "image": "polarfuchsschimmel.jpg"
  },
  {
    "name": "Algierfuchsschimmel",
-    "canonicalGenotype": "AA CC DD efef GG PP spsp rere",
+    "canonicalGenotype": "AA CC DD efe GG PP spsp rere",
    "sortOrder": 38,
    "image": "algierfuchsschimmel.jpg"
  },
  {
    "name": "Kohlfuchsschimmel",
-    "canonicalGenotype": "aa CC DD efef GG PP spsp rere",
+    "canonicalGenotype": "aa CC DD efe GG PP spsp rere",
    "sortOrder": 39,
    "image": "kohlfuchsschimmel.jpg"
  },
  {
    "name": "Blaufuchsschimmel",
-    "canonicalGenotype": "aa CC DD efef gg PP spsp rere",
+    "canonicalGenotype": "aa CC DD efe gg PP spsp rere",
    "sortOrder": 40,
    "image": "blaufuchsschimmel.jpg"
  },
@@ -272,7 +272,7 @@
  },
  {
    "name": "Goldfuchsschimmel",
-    "canonicalGenotype": "AA CC DD efef GG pp spsp rere",
+    "canonicalGenotype": "AA CC DD efe GG pp spsp rere",
    "sortOrder": 43,
    "image": "goldfuchsschimmel.jpg"
  },
@@ -290,7 +290,7 @@
  },
  {
    "name": "Rotfuchsschimmel",
-    "canonicalGenotype": "aa CC DD efef GG pp spsp rere",
+    "canonicalGenotype": "aa CC DD efe GG pp spsp rere",
    "sortOrder": 46,
    "image": "rotfuchsschimmel.jpg"
  },
@@ -302,7 +302,7 @@
  },
  {
    "name": "Kohlfuchsschimmel, hell",
-    "canonicalGenotype": "aa CC DD efef GG PP spsp rere",
+    "canonicalGenotype": "aa CC DD efe GG PP spsp rere",
    "sortOrder": 48,
    "image": "kohlfuchsschimmel-hell.jpg"
  },
@@ -332,7 +332,7 @@
  },
  {
    "name": "Dilute Blaufuchs",
-    "canonicalGenotype": "aa CC dd ee gg pp spsp rere",
+    "canonicalGenotype": "aa CC dd ee gg PP spsp rere",
    "sortOrder": 53,
    "image": "blaufuchs-dd.jpg"
  },
--- a/gerbil-manager-web/src/genetics/colorVarietySeed.generated.json
+++ b/gerbil-manager-web/src/genetics/colorVarietySeed.generated.json
@@ -236,25 +236,25 @@
  },
  {
    "name": "Polarfuchsschimmel",
-    "canonicalGenotype": "AA CC DD e[f]e[f] gg PP spsp",
+    "canonicalGenotype": "AA CC DD ee[f] gg PP spsp",
    "sortOrder": 37,
    "image": "polarfuchsschimmel.jpg"
  },
  {
    "name": "Algierfuchsschimmel",
-    "canonicalGenotype": "AA CC DD e[f]e[f] GG PP spsp",
+    "canonicalGenotype": "AA CC DD ee[f] GG PP spsp",
    "sortOrder": 38,
    "image": "algierfuchsschimmel.jpg"
  },
  {
    "name": "Kohlfuchsschimmel",
-    "canonicalGenotype": "aa CC DD e[f]e[f] GG PP spsp",
+    "canonicalGenotype": "aa CC DD ee[f] GG PP spsp",
    "sortOrder": 39,
    "image": "kohlfuchsschimmel.jpg"
  },
  {
    "name": "Blaufuchsschimmel",
-    "canonicalGenotype": "aa CC DD e[f]e[f] gg PP spsp",
+    "canonicalGenotype": "aa CC DD ee[f] gg PP spsp",
    "sortOrder": 40,
    "image": "blaufuchsschimmel.jpg"
  },
@@ -272,7 +272,7 @@
  },
  {
    "name": "Goldfuchsschimmel",
-    "canonicalGenotype": "AA CC DD e[f]e[f] GG pp spsp",
+    "canonicalGenotype": "AA CC DD ee[f] GG pp spsp",
    "sortOrder": 43,
    "image": "goldfuchsschimmel.jpg"
  },
@@ -290,7 +290,7 @@
  },
  {
    "name": "Rotfuchsschimmel",
-    "canonicalGenotype": "aa CC DD e[f]e[f] GG pp spsp",
+    "canonicalGenotype": "aa CC DD ee[f] GG pp spsp",
    "sortOrder": 46,
    "image": "rotfuchsschimmel.jpg"
  },
@@ -302,7 +302,7 @@
  },
  {
    "name": "Kohlfuchsschimmel, hell",
-    "canonicalGenotype": "aa CC DD e[f]e[f] GG PP spsp",
+    "canonicalGenotype": "aa CC DD ee[f] GG PP spsp",
    "sortOrder": 48,
    "image": "kohlfuchsschimmel-hell.jpg"
  },
@@ -332,7 +332,7 @@
  },
  {
    "name": "Dilute Blaufuchs",
-    "canonicalGenotype": "aa CC dd ee gg pp spsp",
+    "canonicalGenotype": "aa CC dd ee gg PP spsp",
    "sortOrder": 53,
    "image": "blaufuchs-dd.jpg"
  },
--- a/gerbil-manager-web/src/genetics/genotype.ts
+++ b/gerbil-manager-web/src/genetics/genotype.ts
@@ -40,6 +40,38 @@ export function canonicalPair(locus: LocusKey, a: string, b: string): AllelePair
  return rank(a) <= rank(b) ? [a, b] : [b, a]
 }

+/**
+ * GEN-5 — the breeder's UNKNOWN-allele rule (ticket 3e643ef1, confirmed by the
+ * Züchterin): an unknown allele '?' is a COPY of the known, visible partner
+ * allele until the gene is determined.  So a single-unknown pair resolves to the
+ * homozygote of the KNOWN allele:
+ *   A?  → AA      D?  → DD      [e,?] → ee      [E,?] → EE      [ef,?] → ef/ef
+ * Only when BOTH alleles are unknown is the locus genuinely undetermined; it then
+ * falls back to the wild-type reading (most-dominant colour allele, but the
+ * recessive UNMARKED allele for the Sp/Re/Sls markers so an unknown marker never
+ * implies Schecke/Rex/WP).
+ *
+ * This single rule is shared by phenotype/catalog resolution (catalog.ts) and the
+ * Punnett gamete weights (punnett.ts), so an unknown allele never invents a
+ * recessive phenotype (no phantom Dilute/efef/Unbekannt in offspring lists).
+ */
+export function resolveAllelePair(locus: LocusKey, pair: AllelePair): [string, string] {
+  const [a, b] = pair
+  const aUnknown = a === WILDCARD
+  const bUnknown = b === WILDCARD
+  if (!aUnknown && !bUnknown) return [a, b]
+  if (aUnknown && bUnknown) {
+    // Fully unknown: wild-type reading (markers default to the unmarked recessive).
+    const alleles = LOCI[locus].alleles
+    const isMarker = locus === 'Sp' || locus === 'Re' || locus === 'Sls'
+    const fb = isMarker ? alleles[alleles.length - 1] : alleles[0]
+    return [fb, fb]
+  }
+  // Exactly one unknown → copy of the known partner allele (homozygous).
+  const known = aUnknown ? b : a
+  return [known, known]
+}
+
 function assertAllele(locus: LocusKey, allele: string): void {
  if (allele === WILDCARD) return
  if (!LOCI[locus].alleles.includes(allele)) {
@@ -180,27 +212,27 @@ function normalizeToken(tok: string): string | null {
  let t = tok
  if (t === 'WP') t = 'Slsl'
  t = t.replace(/S\(l\)/g, 'Sl').replace(/s\(l\)/g, 'sl')
-  // GEN-3b (#32/#34): Underwhite == G locus. Strip the breeder's "[d]" (dense
-  // underwhite) annotation from the uw/Uw token BEFORE aliasing to G/g, so that
-  // "Uwuw[d]" → "Gg" and "uw[d]uw[d]" → "gg" (mirrors tools/import/genotype.py
-  // _rewrite_uw). Without this the "[d]" survived → splitToken("Gg[d]") threw and
-  // the frontend fell back to "Unbekannter Farbschlag" / leaked the raw uw token.
-  t = t.replace(/(Uw|uw)\[d\]/g, '$1')
+  // GEN-5: dense-underwhite modifier uw[d]/Uw[d] (G-locus). The German "[d]"
+  // dense marker is a shade qualifier, not a separate allele — strip it BEFORE
+  // the Uw→G alias so e.g. "Uwuw[d]" / "uw[d]uw[d]" parse as Gg / gg, not "Gg[d]"
+  // (which crashes splitToken). Mirrors tools/import/genotype.py _rewrite_uw.
+  t = t.replace(/uw\[d\]/gi, 'uw')
  t = t.replace(/Uw/g, 'G').replace(/uw/g, 'g')
  // GEN-3h: accept bracket display notation → canonical internal symbols.
  t = t.replace(/e\[f\]/g, 'ef')     // Schimmel allele display form → internal
  t = t.replace(/c\[chm\]/g, 'cchm') // Colourpoint display form → internal
  t = t.replace(/c\[h\]/g, 'ch')     // Himalayan display form → internal
-  // #42 (E-locus e-dash): Fuchs (e) is RECESSIVE — a visible fox MUST be
-  // homozygous "ee".  The herdbook form "ee[-]" (fox allele + unknown E-type
-  // second allele) therefore resolves to "ee" (Fuchs), NOT [e,?]; the recessive
-  // phenotype implies homozygosity.  A bare "e-" / "e[-]" (a single recessive
-  // fox allele with an unknown partner) is genetically impossible and is left to
-  // be rejected by splitToken (invalid → genotypeInvalid path).
+  // #42 (E-locus): a visible Fuchs is RECESSIVE → MUST be homozygous "ee". The herdbook
+  // form "ee[-]" (fox allele + unknown E-type partner) therefore resolves to "ee" (Fuchs),
+  // NOT [e,?] — the recessive phenotype implies homozygosity. A bare "e-"/"e[-]" (a lone
+  // recessive fox with an unknown partner) is genetically impossible and is rejected below.
  t = t.replace(/ee\[-\]/g, 'ee').replace(/ee-/g, 'ee')
-  // CR-1a: allele-prefixed bracket-unknown like cc[-]: when e[-]/c[-] is PRECEDED
-  // by a letter it is the second unknown allele in a 2-allele token.  Lookbehind
-  // strips only the bracket part; the leading allele stays.
+  // CR-1a: allele-prefixed bracket-unknown like ee[-] (Silvain).
+  // When e[-] is PRECEDED by a letter it is the second unknown allele in a
+  // 2-allele token (e.g. ee[-] → e + e[-] → e + ?).  Lookbehind strips only
+  // the e[-] part; the leading allele stays. Standalone e[-] falls through to
+  // the generic [-]→? rule below (which makes the bracket-dash a wildcard,
+  // leaving the leading allele intact for splitToken).
  t = t.replace(/(?<=[A-Za-z])e\[-\]/g, '?')
  t = t.replace(/(?<=[A-Za-z])c\[-\]/g, '?')
  t = t.replace(/(?<=[A-Za-z])c$/g, '?')
@@ -266,12 +298,14 @@ export function fromDisplayString(input: string): Genotype {
    const locus = ALLELE_TO_LOCUS[refAllele]
    if (!locus) throw new Error(`Unknown allele "${refAllele}" in token "${token}"`)
    if (acc[locus]) throw new Error(`Locus ${locus} given twice`)
-    // #42: a lone recessive Fuchs allele with an unknown partner ("e-"/"e[-]" →
-    // [e,?]) is genetically impossible — fox is recessive, so a fox allele is
-    // only visible homozygous (ee, written "ee[-]"). Reject it so the UI surfaces
-    // the genotypeInvalid message instead of silently mis-computing the colour.
+    // #42: a lone recessive Fuchs allele with an unknown partner ("e-"/"e[-]" → [e,?]) is
+    // genetically impossible — fox is recessive, so a fox allele is only visible homozygous
+    // ("ee", written "ee[-]"). Reject it so the UI surfaces the invalid-genotype message
+    // instead of silently mis-computing the colour. ("ee[-]" was already normalized to "ee".)
    if (locus === 'E' && ((a === 'e' && b === WILDCARD) || (a === WILDCARD && b === 'e'))) {
-      throw new Error(`Invalid E-locus token "${token}": lone recessive "e" with unknown partner (use "ee[-]" for Fuchs or "E-" for unknown)`)
+      throw new Error(
+        `Invalid E-locus token "${token}": lone recessive "e" with unknown partner (use "ee[-]" for Fuchs or "E-" for unknown)`,
+      )
    }
    acc[locus] = canonicalPair(locus, a, b)
  }
@@ -301,3 +335,75 @@ export function displayGenotypeSafe(raw: string | null | undefined): string {
 export function hasUnknown(g: Genotype): boolean {
  return LOCUS_ORDER.some((l) => g[l][0] === WILDCARD || g[l][1] === WILDCARD)
 }
+
+/** Per-locus note about an allele that parent-inference filled in. */
+export interface ParentInferredLocus {
+  readonly locus: LocusKey
+  /** The allele a homozygous parent forced onto the child. */
+  readonly allele: string
+  /** 'father' | 'mother' — which parent was homozygous. */
+  readonly from: 'father' | 'mother'
+}
+
+export interface ParentInferenceResult {
+  readonly genotype: Genotype
+  /** Loci whose unknown allele was resolved from a parent (empty = nothing changed). */
+  readonly inferred: ParentInferredLocus[]
+}
+
+/**
+ * GEN-5 (tickets cc9ea3fe / 1a508c04, breeder rule via Mendel): a child's UNKNOWN
+ * allele can be filled in from a HOMOZYGOUS parent, which can only pass that one
+ * allele. E.g. Mamta Mini stored E = [E,?]; her father Geely is ee (homozygous
+ * fox) so he must pass an 'e' — the child's unknown E allele therefore IS 'e',
+ * giving Ee (not the copy-of-known EE default).
+ *
+ * Rule, per locus, ONLY for an allele still unknown ('?') in the child:
+ *   - if a parent is homozygous (both alleles equal and known), that allele is
+ *     forced onto the child's unknown slot.
+ *   - the father is checked first; if he doesn't resolve it, the mother is tried.
+ *   - a parent allele is only accepted if it is one the child could legitimately
+ *     carry at that locus (it always is for a real parent, but we guard anyway).
+ * Pairs with no unknown, or where no parent is homozygous, are left untouched
+ * (still subject to the copy-of-known display/colour rule elsewhere).
+ */
+export function inferUnknownsFromParents(
+  child: Genotype,
+  father: Genotype | null | undefined,
+  mother: Genotype | null | undefined,
+): ParentInferenceResult {
+  const out = {} as Record<LocusKey, AllelePair>
+  const inferred: ParentInferredLocus[] = []
+  for (const locus of LOCUS_ORDER) {
+    const [a, b] = child[locus]
+    const aUnknown = a === WILDCARD
+    const bUnknown = b === WILDCARD
+    if (!aUnknown && !bUnknown) {
+      out[locus] = child[locus]
+      continue
+    }
+    const homForced = (p: Genotype | null | undefined): string | null => {
+      if (!p) return null
+      const [pa, pb] = p[locus]
+      if (pa === WILDCARD || pb === WILDCARD) return null
+      return pa === pb ? pa : null
+    }
+    const fatherAllele = homForced(father)
+    const forced = fatherAllele ?? homForced(mother)
+    const from: 'father' | 'mother' = fatherAllele ? 'father' : 'mother'
+    if (forced && (aUnknown !== bUnknown)) {
+      // Exactly one unknown slot → fill it with the forced parent allele.
+      const known = aUnknown ? b : a
+      out[locus] = canonicalPair(locus, known, forced)
+      inferred.push({ locus, allele: forced, from })
+    } else if (forced && aUnknown && bUnknown) {
+      // Both unknown but a parent is homozygous → that allele is certain on one
+      // slot; the other stays unknown.
+      out[locus] = canonicalPair(locus, forced, WILDCARD)
+      inferred.push({ locus, allele: forced, from })
+    } else {
+      out[locus] = child[locus]
+    }
+  }
+  return { genotype: makeGenotype(out), inferred }
+}
--- a/gerbil-manager-web/src/genetics/index.ts
+++ b/gerbil-manager-web/src/genetics/index.ts
@@ -21,9 +21,16 @@ export {
  fromJSON,
  hasUnknown,
  displayGenotypeSafe,
+  resolveAllelePair,
+  inferUnknownsFromParents,
  WILDCARD,
 } from './genotype'
-export type { Genotype, AllelePair } from './genotype'
+export type {
+  Genotype,
+  AllelePair,
+  ParentInferenceResult,
+  ParentInferredLocus,
+} from './genotype'

 export { LOCI, LOCUS_ORDER } from './loci'
 export type { LocusKey, LocusDef } from './loci'
--- a/gerbil-manager-web/src/genetics/punnett.ts
+++ b/gerbil-manager-web/src/genetics/punnett.ts
@@ -10,72 +10,40 @@
 * Wildcard ("?") alleles are expanded uniformly over the locus' allele set
 * before combining, so a parent known only by phenotype can still be paired.
 */
-import { add, frac, multiply, ONE, type Fraction } from './fraction'
-import { dominanceRank, LOCI, LOCUS_ORDER, type LocusKey } from './loci'
+import { add, frac, multiply, type Fraction, ONE } from './fraction'
+import { LOCUS_ORDER, type LocusKey } from './loci'
 import {
  canonicalPair,
+  resolveAllelePair,
  toDisplayString,
-  WILDCARD,
  type AllelePair,
  type Genotype,
 } from './genotype'

-/**
- * #37/#39/#40/#41: which concrete alleles an UNKNOWN partner allele may actually be,
- * given the KNOWN allele it is paired with at this locus.
- *
- * A hidden allele is constrained by the recorded (visible) one:
- *   1. It can NEVER be more dominant than the known allele — otherwise the animal's
- *      phenotype would be different from what the breeder recorded.  So the unknown
- *      only ranges over alleles with dominance rank >= rank(known) (equal or more
- *      recessive).  This kills impossible more-dominant offspring morphs.
- *   2. It can never be an allele that is VISIBLE in the heterozygote, unless the
- *      animal already expresses it.  At the E locus 'ef' (Schimmel/roan) shows even
- *      heterozygously, so a non-Schimmel animal (known E or e) cannot secretly carry
- *      'ef'.  Excluding it removes the phantom Schimmel/efef predictions (#41).
- *
- * When BOTH alleles are unknown the locus is genuinely unconstrained → full set.
- */
-function unknownPartnerOptions(locus: LocusKey, known: string): readonly string[] {
-  const alleles = LOCI[locus].alleles
-  if (known === WILDCARD) return alleles // fully unknown locus: any allele
-  const knownRank = dominanceRank(locus, known)
-  return alleles.filter((a) => {
-    if (dominanceRank(locus, a) < knownRank) return false // can't outrank the visible allele
-    // E-locus 'ef' is visible in het: only possible if the animal is itself Schimmel.
-    if (locus === 'E' && a === 'ef' && known !== 'ef') return false
-    return true
-  })
-}
-
 /** A probability distribution over outcomes of type T (keyed by a string). */
 export interface DistEntry<T> {
  readonly value: T
  readonly probability: Fraction
 }

-/** Expand a (possibly wildcard) parent allele pair into weighted concrete alleles. */
+/**
+ * Expand a (possibly partly-unknown) parent allele pair into weighted concrete
+ * gamete alleles.
+ *
+ * GEN-5 (ticket 3e643ef1, breeder rule): an unknown allele '?' is a COPY of the
+ * known partner allele (A?→AA, D?→DD, [e,?]→ee), NOT a uniform spread over the
+ * whole allele set. Spreading wrongly invented recessive gametes (d, ef, e) that
+ * produced impossible offspring colours — phantom Dilute, efef Schimmel and
+ * 'Unbekannter Farbschlag' in the expected-litter list. After resolution each of
+ * the two (now concrete) alleles contributes 1/2 of the gamete. A fully-unknown
+ * locus resolves to the wild-type homozygote (see resolveAllelePair).
+ */
 function parentAlleleWeights(locus: LocusKey, pair: AllelePair): Map<string, Fraction> {
  const weights = new Map<string, Fraction>()
  const addWeight = (allele: string, w: Fraction) => {
    weights.set(allele, add(weights.get(allele) ?? frac(0, 1), w))
  }
-  // The "other" allele of the pair tells us what an unknown is allowed to be:
-  // an unknown partner is constrained by the known visible allele (see
-  // unknownPartnerOptions), not blown up uniformly over every allele.
-  const [a0, a1] = pair
-  for (let i = 0; i < 2; i++) {
-    const a = pair[i]
-    if (a === WILDCARD) {
-      const known = i === 0 ? a1 : a0
-      const options = unknownPartnerOptions(locus, known)
-      // Unknown allele contributes 1/2 of the gamete, split over its possible values.
-      const share = frac(1, 2 * options.length)
-      for (const concrete of options) addWeight(concrete, share)
-    } else {
-      addWeight(a, frac(1, 2))
-    }
-  }
+  for (const a of resolveAllelePair(locus, pair)) addWeight(a, frac(1, 2))
  return weights
 }

--- a/gerbil-manager-web/src/pages/GerbilDetailPage.tsx
+++ b/gerbil-manager-web/src/pages/GerbilDetailPage.tsx
@@ -7,7 +7,14 @@ import { listColorVarieties, listContacts, listEnclosures, listLitters } from '.
 import { useApi, useMutation } from '../hooks/useApi'
 import { formatDate, genderLabel, statusLabel } from '../format/labels'
 import { ALL_TRAITS, TRAIT_CATEGORIES } from '../format/traits'
-import { fromDisplayString, genotypeToFarbschlag, displayGenotypeSafe } from '../genetics'
+import {
+  fromDisplayString,
+  genotypeToFarbschlag,
+  displayGenotypeSafe,
+  toDisplayString,
+  hasUnknown,
+  inferUnknownsFromParents,
+} from '../genetics'
 import type { Gender, GerbilStatus } from '../api/types'
 import FarbschlagImage from '../components/FarbschlagImage'
 import GerbilAcquisitionSection from '../components/GerbilAcquisitionSection'
@@ -140,6 +147,37 @@ export default function GerbilDetailPage() {
  const showEnclosure = g.status !== 'Deceased' && g.status !== 'GivenAway'

  const geno = describeGenotype(g.genotype)
+  // GEN-5 (Tickets cc9ea3fe / 1a508c04): unbekannte Gencode-Buchstaben aus einem
+  // reinerbigen Elternteil ergänzen (Mendel: ein reinerbiger Elternteil kann nur
+  // dieses eine Allel vererben). Greift nur, wenn der Genotyp ein '-' enthält UND
+  // mindestens ein Elternteil mit Genotyp am eigenen Wurf hinterlegt ist.
+  const genoInferred = (() => {
+    if (!g.genotype) return null
+    let child
+    try {
+      child = fromDisplayString(g.genotype)
+    } catch {
+      return null
+    }
+    if (!hasUnknown(child)) return null
+    const parse = (s: string | null | undefined) => {
+      if (!s) return null
+      try {
+        return fromDisplayString(s)
+      } catch {
+        return null
+      }
+    }
+    const f = parse(father.data?.genotype)
+    const m = parse(mother.data?.genotype)
+    if (!f && !m) return null
+    const res = inferUnknownsFromParents(child, f, m)
+    if (res.inferred.length === 0) return null
+    const display = toDisplayString(res.genotype)
+    if (display === geno?.display) return null
+    return { display, farbschlag: genotypeToFarbschlag(res.genotype) }
+  })()
+
  const lookup = (map: Map<string, string>, key: string | null) => (key ? (map.get(key) ?? '—') : '—')
  const storedColorName = g.colorVarietyId ? (colorName.get(g.colorVarietyId) ?? null) : null

@@ -346,14 +384,29 @@ export default function GerbilDetailPage() {
            <dl className="ak-kvlist">
              <Kv label={t.fields.genotype}>
                <code className="ak-genotype">{geno.display}</code>
+                {genoInferred && (
+                  <span className="ak-inferred" title={t.detail.genotypeInferredTitle}>
+                    {' → '}
+                    <code className="ak-genotype">{genoInferred.display}</code>{' '}
+                    <small className="ak-inferred-chip">⮑ {t.detail.genotypeInferred}</small>
+                  </span>
+                )}
              </Kv>
              <Kv label={t.detail.resolvedPrefix}>
-                {geno.farbschlag}
-                {storedColorName &&
-                  geno.farbschlag !== de.genetics.unknownFarbschlag &&
-                  storedColorName !== geno.farbschlag.replace(' Schecke', '').replace(' Rex', '') && (
-                    <small className="ak-mismatch"> ⚠ {t.detail.farbschlagMismatch}</small>
-                  )}
+                {(() => {
+                  const resolvedFarbschlag = (genoInferred ?? geno).farbschlag
+                  return (
+                    <>
+                      {resolvedFarbschlag}
+                      {storedColorName &&
+                        resolvedFarbschlag !== de.genetics.unknownFarbschlag &&
+                        storedColorName !==
+                          resolvedFarbschlag.replace(' Schecke', '').replace(' Rex', '') && (
+                          <small className="ak-mismatch"> ⚠ {t.detail.farbschlagMismatch}</small>
+                        )}
+                    </>
+                  )
+                })()}
              </Kv>
            </dl>
          ) : (
--- a/gerbil-manager-web/src/pages/rennmausakte.css
+++ b/gerbil-manager-web/src/pages/rennmausakte.css
@@ -286,6 +286,20 @@
  color: var(--ak-warn);
  font-weight: 600;
 }
+/* GEN-5: parent-inferred genotype hint (Ee[-] → Ee aus den Eltern ergänzt). */
+.ak-inferred {
+  white-space: nowrap;
+}
+.ak-inferred-chip {
+  display: inline-block;
+  background: var(--ak-tan);
+  color: var(--color-text);
+  border-radius: 999px;
+  padding: 1px 9px;
+  font-weight: 600;
+  font-size: 12px;
+  vertical-align: middle;
+}

 /* ---------- Character chips ---------- */
 .ak-cgroup {
--- a/gerbil-manager-web/src/strings/de.ts
+++ b/gerbil-manager-web/src/strings/de.ts
@@ -112,6 +112,10 @@ export const de = {
        resolvedPrefix: 'Errechnet',
        farbschlagMismatch: 'Weicht vom eingetragenen Farbschlag ab.',
        genotypeNotSet: 'Kein Genotyp hinterlegt.',
+        // GEN-5: ein unbekannter Gencode-Buchstabe wurde aus einem reinerbigen
+        // Elternteil ergänzt (z. B. Vater ee ⇒ Kind erbt e). %s = aufgelöster Genotyp.
+        genotypeInferred: 'Aus den Eltern ergänzt',
+        genotypeInferredTitle: 'Ein unbekanntes Gen wurde aus einem reinerbigen Elternteil abgeleitet.',
        testMating: 'Probeverpaarung',
        edit: 'Bearbeiten',
        back: 'Zurück zur Liste',
--- a/tools/import/test_genotype.py
+++ b/tools/import/test_genotype.py
@@ -28,6 +28,11 @@ r = g.parse("uwuw")
 check("uwuw -> gg", r["mapped8locus"].get("G") == ["g", "g"])
 r = g.parse("uw[d]uw[d]")
 check("uw[d]uw[d] -> gg (dense underwhite)", r["mapped8locus"].get("G") == ["g", "g"])
+# GEN-5 (ticket 5151ab20 / Vance): the het 'Uwuw[d]' (one Underwhite, one dense
+# underwhite) must parse to the G locus as Gg — never crash on the [d] modifier.
+r = g.parse("aa Cc[chm] D- ee Uwuw[d] PP spsp")
+check("Uwuw[d] -> Gg (Vance, het dense underwhite)", r["mapped8locus"].get("G") == ["G", "g"])
+check("Uwuw[d] full string: nothing unmapped", r["unmappedTokens"] == [])

 # Gg and Uwuw must produce the SAME mapped locus (so they stop being a conflict)
 check("Gg identical to Uwuw at G locus",