Question

In cats, curled ears result from an allele (Cu) that is dominant over an allele (cu) for normal ears. Black color results from an independently assorting gene (G) that is dominant over an allele for gray (g). A gray cat homozygous for curled ears is mated with a homozygous black cat with normal ears.

a. What is the phenotype and genotype of the F1

b. If an F1 mates with a stray cat that is homozygous for black and normal ears, what phenotypes and proportions are expected from this cross?

Answer 1

Answer1) The genotype characterstics will be GgCucu and physical chracterstics will be Curled ears and Black color.

Answer 2) The mating of a F₁ cat (GgCucu) with a gray cat with normal ears (ggcucu) is a testcross in which we would expect to produce equal numbers of all the different progeny classes:

                ¼ Black with curly ears

                ¼ Black with normal ears

                ¼ Gray with curly ears

                ¼ Gray with normal ears