Question

Assume that in pea plants yellow and smooth are dominant and unlinked (independent) traits. If a...

Assume that in pea plants yellow and smooth are dominant and unlinked (independent) traits. If a heterozygous yellow, wrinkled plant is mated with a plant that is heterozygous for both traits, what fraction of the offspring can be expected to be green and wrinkled?

Group of answer choices

1/4

3/16

1/8

1/16

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Answer #1

Let smooth trait is encoded by S allele and it is dominant over s allele.

Yellow plant is encoded by Y allele and it is dominant over y allele.

Parents : heterozygous yellow and wrinkled ( Yyss) × heterozygous for both trait ( YySs)

Punnet square:

Gametes YS Ys yS ys
Ys YYSs ( yellow smooth) YYss ( yellow wrinked) YySs ( yellow smooth) Yyss (yellow wrinkled)
ys YySs ( yellow smooth) Yyss ( yellow, wrinkled) yySs( green smooth) yyss ( green wrinkled)

Green wrinklef fraction is 1/8

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