Question

For a poly hybrid cross concerning N trait, what is the number of squares required in the Punnett square to check for the F2 generation?

(a) 2^N

(b) N^2

(c) 2^(2N)

(d) (2N)^2

The question was posed to me during a job interview.

Origin of the question is Inheritance of Two Genes-2 topic in chapter Principles of Inheritance and Variation of Biology – Class 12

Answer 1

Correct choice is (c) 2^(2N)

To explain: For a poly hybrid cross involving N traits, according to the law of independent assortment, 2^N types of gametes will be produced by each parent. Therefore, the cross of these progeny will give (2^N)*(2^N) = 2^(2N).