diff --git a/gerbil-manager-web/e2e/genotype-table.spec.ts b/gerbil-manager-web/e2e/genotype-table.spec.ts
new file mode 100644
index 0000000..0f518bc
--- /dev/null
+++ b/gerbil-manager-web/e2e/genotype-table.spec.ts
@@ -0,0 +1,54 @@
+/**
+ * UX-MOBILE-2: Genotyp-Tabellen-Overflow — die Tabelle scrollt horizontal,
+ * die Seite selbst bleibt NICHT breiter als der Viewport (kein horizontaler
+ * Page-Overflow auf 390px).
+ */
+import { de, expect, skipUnlessMock, test } from './fixtures'
+
+const tl = de.pages.litters
+
+test('Phone: Genotyp-Detail-Tabelle scrollt im eigenen Wrapper, kein Page-Overflow', async ({
+  page,
+}, testInfo) => {
+  skipUnlessMock()
+  if (testInfo.project.name !== 'phone') return
+
+  // Wurf w-kruemel hat beide Eltern mit Genotypen → BreedingResultView rendert.
+  await page.goto('/wuerfe/w-kruemel')
+  await expect(page.getByRole('heading', { name: 'Wurf K' })).toBeVisible()
+  await expect(page.getByText(tl.detail.expectedColors).first()).toBeVisible()
+
+  // Genotyp-Detail-Tabelle ausklappen.
+  await page.getByRole('button', { name: de.pages.genetik.showGenotypes }).click()
+
+  // Scroll-Wrapper und Tabelle müssen vorhanden und sichtbar sein.
+  const wrapper = page.locator('.genotype-table-scroll').first()
+  await expect(wrapper).toBeVisible()
+  await expect(wrapper.locator('.genotype-table')).toBeVisible()
+
+  // Wrapper ist selbst scrollbar (Tabelle breiter als der sichtbare Bereich).
+  const wrapperScrollable = await wrapper.evaluate(
+    (el) => el.scrollWidth > el.clientWidth,
+  )
+  expect(wrapperScrollable).toBe(true)
+
+  // Die Seite selbst darf NICHT breiter als der Viewport sein.
+  const pageOverflow = await page.evaluate(
+    () => document.documentElement.scrollWidth > document.documentElement.clientWidth,
+  )
+  expect(pageOverflow).toBe(false)
+})
+
+test('Desktop: Genotyp-Detail-Tabelle zeigt Wrapper auch auf breitem Viewport', async ({
+  page,
+}, testInfo) => {
+  skipUnlessMock()
+  if (testInfo.project.name !== 'desktop') return
+
+  await page.goto('/wuerfe/w-kruemel')
+  await expect(page.getByText(tl.detail.expectedColors).first()).toBeVisible()
+  await page.getByRole('button', { name: de.pages.genetik.showGenotypes }).click()
+
+  await expect(page.locator('.genotype-table-scroll').first()).toBeVisible()
+  await expect(page.locator('.genotype-table').first()).toBeVisible()
+})
diff --git a/gerbil-manager-web/src/components/BreedingResultView.tsx b/gerbil-manager-web/src/components/BreedingResultView.tsx
index b8941ac..207c583 100644
--- a/gerbil-manager-web/src/components/BreedingResultView.tsx
+++ b/gerbil-manager-web/src/components/BreedingResultView.tsx
@@ -65,28 +65,30 @@ export default function BreedingResultView({ result, title }: BreedingResultView
           </button>
 
           {showGenotypes && (
-            <table className="genotype-table">
-              <thead>
-                <tr>
-                  <th>{t.genotypeLabel}</th>
-                  <th>{t.genotypePreview}</th>
-                  <th>{t.probability}</th>
-                </tr>
-              </thead>
-              <tbody>
-                {result.offspring.map((o) => (
-                  <tr key={o.genotype}>
-                    <td>
-                      <code>{o.genotype}</code>
-                    </td>
-                    <td>{o.farbschlag}</td>
-                    <td>
-                      {o.probability.percent} <small>({o.probability.text})</small>
-                    </td>
+            <div className="genotype-table-scroll">
+              <table className="genotype-table">
+                <thead>
+                  <tr>
+                    <th>{t.genotypeLabel}</th>
+                    <th>{t.genotypePreview}</th>
+                    <th>{t.probability}</th>
                   </tr>
-                ))}
-              </tbody>
-            </table>
+                </thead>
+                <tbody>
+                  {result.offspring.map((o) => (
+                    <tr key={o.genotype}>
+                      <td>
+                        <code>{o.genotype}</code>
+                      </td>
+                      <td>{o.farbschlag}</td>
+                      <td>
+                        {o.probability.percent} <small>({o.probability.text})</small>
+                      </td>
+                    </tr>
+                  ))}
+                </tbody>
+              </table>
+            </div>
           )}
         </>
       )}
diff --git a/gerbil-manager-web/src/index.css b/gerbil-manager-web/src/index.css
index 2dbc2d4..115112e 100644
--- a/gerbil-manager-web/src/index.css
+++ b/gerbil-manager-web/src/index.css
@@ -77,6 +77,10 @@ a {
   padding: 1rem;
   max-width: 60rem;
   width: 100%;
+  /* UX-MOBILE-2: prevent any wide content (e.g. genotype table) from making
+     the page body scroll horizontally. The .genotype-table-scroll wrapper
+     provides the per-table horizontal scroll. */
+  overflow-x: hidden;
 }
 
 /* Tab-Leiste unten */
@@ -559,8 +563,14 @@ textarea {
   white-space: nowrap;
 }
 
+/* UX-MOBILE-2: scroll wrapper so genotype table scrolls horizontally on mobile
+   instead of overflowing the page. */
+.genotype-table-scroll {
+  overflow-x: auto;
+  -webkit-overflow-scrolling: touch;
+}
+
 .genotype-table {
-  width: 100%;
   border-collapse: collapse;
   margin-top: 0.75rem;
   font-size: 0.9rem;
@@ -571,6 +581,7 @@ textarea {
   text-align: left;
   padding: 0.4rem 0.5rem;
   border-bottom: 1px solid var(--color-border);
+  white-space: nowrap;
 }
 
 .genotype-table code {