2 pt. In chickens, comb shape is influenced by the interaction between two diffe

Question

2 pt. In chickens, comb shape is influenced by the interaction between two different gene pairs where the two gene pairs cooperate to produce a phenotype that neither can prod alione. The allelic combination rr at one locus together with pp at the other gives rise to the ype that neither can produce most common phenotype, the single co alleles are present together. Depending on the allelic combinations, the two gene pairs can produce the rose, pea or walnut combs as well as the single comb phenotypes. If a true breeding rose comb (RRpp) mates with a true breeding pea comb (rrPP), answer the yp, the single comb. The walnut comb occurs when the two dominant following questions. a. What are the expected genotypic and phenotypic ratios of the F1 generation? b. What is the expected phenotypic ratio in the F2 generation? c. In the F2 generation, what are the expected genotypes of each comb type? d. What is the probability of producing a homozygous dominant genotype? Homozygous recessive genotype?

Explanation / Answer

a. genotype ratio 9:3:1

Phenotype ratio 2:3

b. 1:3

c. 2:3

d.

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