The F₂ ratio in complementary gene action is

A. 9 : 3 : 4

B. 9 : 7

C. 15 : 1

D. 18 : 3

Answer: Option B

Solution(By Examveda Team)

The F2 ratio in complementary gene action is 9 : 7.
Complementary gene action is when two different genes work together to contribute to one single trait. These two genes are involved in a specific pathway, like a biochemical reaction, and produce functional products required to produce a certain trait.
A dihybrid cross of complementary genes in F2 generation gives phenotypic ratio as 9 : 7.