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Question

If a polygenic trait is controlled by three gene pairs then what will be the probability of individuals in F2 generation showing exacts phenotype to F1 progeny?

A
6/16
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B
4/64
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C
20/64
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D
1/16
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Solution

The correct option is B 20/64
For a polygenic trait controlled by two gene pairs, the probability of individuals in F2 generation showing exact phenotype to F1 is 20. E.g., a creative between pure white and negro human skin color yields mullet in F 1 and in F 2 where phenotype ratio I :6:15:20:15:6:1 where mullet is 20.
So, the correct answer is option C.

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