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Question

Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) x aabbcc (light colour), in the F2 generation, what proportion of progeny is likely to resemble either parent?

A
Half
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B
Less than 5%
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C
One third
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D
More than 10%
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Solution

The correct option is B Less than 5%
AABBCC (dark grains) x aabbcc (light grains)

F1: AaBbCc

F2: (selfing) AaBbCc x AaBbCc



Since, the trait is a polygene, only 2 progenies (AABBCC and aabbcc) out of 64 progenies will resemble either parent. Hence, the percentage of progeny which is likely to resemble either parent = 264×100 = 3.125% which is less than 5%.

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