Duplicating Genes 15:1 Ratio | Duplicate Dominant Epistasis NEET Class 12 | Neela Bakore Tutorials

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Either dominant allele alone produces the same trait — Duplicating Genes give a 15:1 ratio!

📌 Topics Covered:
• Duplicating Genes (Duplicate Dominant Epistasis)
• 15:1 phenotypic ratio — how it arises
• Example: wheat grain colour
• Distinguishing 15:1 from 9:7, 9:6:1, 13:3, 12:3:1
• Common NEET mistakes and solutions
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Transcript with Timestamp
0:00 Introduction — Duplicate Genes
0:22 Definition: both genes independently produce same phenotype
0:31 Example: Capsella bursa-pastoris (Shepherd’s Purse) — fruit shape
0:52 Two shapes: Triangular (dominant) and Elongated
1:25 Gene T OR Gene D → triangular. Only ttdd → elongated
2:38 Cross: TTdd × ttDD → F1 all triangular
4:51 F2 ratio: 15 triangular : 1 elongated
8:39 ⚠️ Ratio = 15:1 — modified form of 9:3:3:1
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