Refer to the Figure of Chicken Combs

question 130

Multiple Choice

Refer to the figure of chicken combs.In chickens, when the dominant alleles of the genes for rose comb (R) and pea comb (A) are present together (R_A_) , the result is a bird with a walnut comb.Chickens that are homozygous recessive for both genes produce a single comb.A rose-combed bird is mated with a walnut-combed bird and produces offspring in the proportion 3 walnut : 3 rose : 1 pea : 1 single. What were the genotypes of the parents?

• A) RRaa and RrAa
• B) Rraa and RRAa
• C) RRaa and RRAa
• D) Rraa and RrAa
• E) Rraa and RrAA

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