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In chickens, the presence of feathers on the legs is due to a dominant allele (F), and the absence of leg feathers is due to a recessive allele (f). The comb on the top of the head can be either pea-shaped, a phenotype that is controlled by a dominant allele (P), or a single comb controlled by a recessive allele (p). The two genes assort independently. Assume that a pure-breeding rooster that has feathered legs and a single comb is crossed with a pure-breeding hen that has no leg feathers and a pea-shaped comb. The F1 are crossed to produce the F2. Among the resulting F2, however, only birds with a single comb and feathered legs are allowed to mate. These chickens mate at random to produce F3 progeny. What is the expected phenotype ratio for the resulting F3 progeny?
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In chickens, the presence of feathers on the legs is due to a dominant allele (F), and the absence o...
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