fix(genetics): Engine-Fixes Ticket-Triage (Goldfuchsschimmel, Dilute CP-Blaufuchs, Eltern-Inferenz, Punnett, uw[d])

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

GerbilManagerWebAPI/ApplicationContext.cs

@@ -346,25 +346,28 @@ 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),

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");
+        }
+    }
+}

GerbilManagerWebAPI/Migrations/ApplicationContextModelSnapshot.cs

@@ -451,28 +451,28 @@ 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
                         },
@@ -493,7 +493,7 @@ 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
                         },
@@ -514,7 +514,7 @@ 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
                         },
@@ -528,7 +528,7 @@ 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
                         },
@@ -563,7 +563,7 @@ 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
                         },

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)
   })
 })
 
@@ -547,7 +550,10 @@ 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')
   })
@@ -572,10 +578,13 @@ 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)
@@ -732,3 +741,118 @@ 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([])
+  })
+})

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,
@@ -242,13 +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) {
+  // 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'.
@@ -314,12 +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]

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"
   },

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"
   },

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)) {
@@ -180,6 +212,11 @@ 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-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
@@ -284,3 +321,75 @@ 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 }
+}

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'

gerbil-manager-web/src/genetics/punnett.ts

@@ -10,12 +10,12 @@
  * 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 { 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'
@@ -26,22 +26,24 @@ export interface DistEntry<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))
   }
-  const alleles = LOCI[locus].alleles
-  for (const a of pair) {
-    if (a === WILDCARD) {
-      // Unknown allele: uniform over the locus set, each contributing 1/2 of the gamete.
-      const share = frac(1, 2 * alleles.length)
-      for (const concrete of alleles) addWeight(concrete, share)
-    } else {
-      addWeight(a, frac(1, 2))
-    }
-  }
+  for (const a of resolveAllelePair(locus, pair)) addWeight(a, frac(1, 2))
   return weights
 }
 

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 GerbilHealthTab from '../components/GerbilHealthTab'
@@ -138,6 +145,37 @@ 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
 
@@ -342,14 +380,29 @@ 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>
           ) : (

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 {

gerbil-manager-web/src/strings/de.ts

@@ -106,6 +106,10 @@ 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',

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",