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True breeding domesticated Hens with white feathers and large, single head combs mate with roosters that are true-breeding for dark feathers and small combs. The offspring all resemble their mothers (hens) for these two traits.

a. Which alleles of each trait are dominant, and which are recessive?
b. if the F1 are crossed with each other, what percentage of the F2 would be expected to have dark feathers and long single combs?

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Oseni

(a) The alleles of white feathers and that of single-head combs are dominant while that of the dark feathers and small combs are recessive.

(b) 1/16 or 6.25%

Dihybrid crossing

Since all the offspring resemble their mother, it means the alleles that make up the traits of the mother are dominant over that of the father.

Assuming that:

Feathers color = F/f

Comb type = C/c

Genotype of mother = FFCC

Genotype of father = ffcc

                                    FFCC   x   ffcc

                                            FfCc

Crossing:          FfCc    x    FfCc

Progeny

F_C_ = 9/16

ffC_ = 3/16

F_cc = 3/16

ffcc = 1/16

More on dihybrid crosses can be found here: https://brainly.com/question/1185199

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