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Practice question

MCQ

Question

Two plant genotypes A/a ; b/b ; C/c ; D/d ; E/e. crossing with A/a B/b ; C/c ; d/d ; E/e. Assume the genes assort independently. How many progeny plant are required to screen a/a b/b c/c d/d e/e : (clue : Make separate crosses for each gene to get frequency of genotypes eg : Aa × Aa)

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Explanation

For independent genes multiply individual recessive frequencies. Aa×Aa gives 1/4 aa, b/b×B/b gives 1/2 bb, C/c×C/c gives 1/4 cc, D/d×d/d gives 1/2 dd, E/e×E/e gives 1/4 ee. Product 1/256, requiring at least 256 progeny screened to recover quintuple homozygote.

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