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Item 17 Paft What are the expected genotypes of the resulting F3 progeny? Check all that apply 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 loci 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 Ffpp FfPP ffpp FFPp FFpp fPp fPP FFPP Submit My Answers Give Up Correct Part B What is the expected genotype ratio for the resulting F3 progeny? Express your answer as three numbers separated by colons FFpp : Ffpp : ffpp Submit My Answers Give Up

Explanation / Answer

Trait of F1 generation are,

Ffpp-------> feathered legs, single comb

ffPp ----------> no featherd legs with pea shaped comb.

F1 cross (Ffpp) * (ffPp) results in F2 generation. In F2 generation, progeny with single comb and feahered legs have the genotype Ffpp.

Cross between, Ffpp * Ffpp (F3 generation)

Its resulting genotype will be FFpp - 25%

                                          Ffpp - 50%

                                          ffpp - 25%

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