I need help with these problems please 1. In cats, curled ears result from an al

Question

I need help with these problems please

1. 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 allele (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. All the F1 cats are black and have curled ears. a) What are the genotypes of the parents? b) If two of the FI cats mate, what phenotypes and proportions are expected in the F2? c) An FI cat mates with a stray cat that is gray and possesses normal ears. What phenotypes and proportions of progeny are expected from this cross?

Explanation / Answer

1). a. Grey cat that is homozygous for curled ears (CuCu gg) is mated with black cat that is homozygous for normal ears (cucu GG). Cross between these two will have the offspring with the following genotypes.

CuCu gg* cucu GG (parental genes) = Cucu Gg (all are curled ears black cats).

b). Cross between F1 generation will have the offspring with the following genotypes.

Cucu Gg* Cucu Gg = CuCu GG (1/16 curled black), CuCu Gg (2/16, curled black), Cucu GG (2/16, curled black), Cucu Gg (4/16, curled black), Cucu gg (2/16, curled grey), CuCcu gg (1/16, curled grey), cucu GG (1/16, normal hair, black), cucu Gg (2/16, normal hair black), cucu gg (normal grey).

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