Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. What is the probability of having offspring that have wrinkled seeds and yellow seed color for the cross RRYY times RrYy ?

Wrinkled seeds require two recessive alleles, rr. The RR parent always contributes a dominant R allele, so every offspring has at least one R and none can be wrinkled; therefore the probability of wrinkled, yellow offspring is 0 percent, choice D.

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