Q:
A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBbCc x AaBbCc, the phenotypic ratio of the offsprings was observed as 1 : 6 : m : 20 : m : 6 : 1. What is the value of m?
Answer & Explanation
Answer: B) 15
Explanation: Here crossing is AaBbCc x AaBbCc
As it is trihybrid cross,
we know, Number of zygotes formed =
Given ratio of offsprings = 1 : 6 : m : 20 : m : 6 : 1
Now, 1 + 6 + m + 20 + m + 6 + 1 = 64
34 + 2m = 64
2m = 30
=> m = 15.
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