Complementary Genes 9:7 Ratio | Gene Interaction NEET Biology Class 12 | Neela Bakore Tutorials

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Both dominant alleles must be present together — Complementary Genes give a 9:7 ratio!

📌 Topics Covered:
• What are Complementary Genes?
• Why 9:7 phenotypic ratio arises
• Classic example: Sweet Pea (Lathyrus odoratus) flower colour
• Differentiating from Duplicate, Collaborator Genes, Epistasis
• Step-by-step cross solving

Transcript with Timestamp
0:00 Introduction — Complementary Genes
0:23 Definition: genes at different loci working together for one expression
0:40 Example: Lathyrus odoratus (Sweet Pea) — purple vs white
1:16 Biochemical pathway: raw material → chromagen (white) → anthocyanin (purple)
1:54 Two enzymes needed: Enzyme 1 (gene C) + Enzyme 2 (gene P)
2:15 BOTH C and P must be dominant for purple colour
5:00 Cross: CCPP (purple) × ccpp (white) → F1 all purple
7:00 F2 selfing: 9 purple : 7 white
12:52 Ratio = 9:7 — modified form of 9:3:3:1

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