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Question

A polygenic trait is controlled by 3 genes A,B and C. In a cross AaBbCc×AaBbCc, the phenotypic ratio of the offsprings was observed as
1:6:x:20:x:6:1 What is the possible value of x?

A
3
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B
9
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C
15
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D
25
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Solution

The correct option is C 15
In polygenic inheritance, a particular trait is controlled by 3 different genes. The given problem is of polygenic inheritance. In this, phenotypic ratio is 1:6:15:20:15:6:1 instead of 27:9:9:9:3:3:3:1 in F2 generation. In the given example, the genotype of parents is AaBbCc and AaBbCc. They will produce gametes ABC, ABc, Abc, abc, aBC, aBc, abC, AbC. The phenotypic ratio will be 1:6:15:20:`15:6:1.
Thus, the correct answer is '15.'

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