5. a. Black coat color in Cocker Spaniels is governed by a dominant allele (B) and red coat color (b) by a recessive allele. Solid pattern (S) is governed by the dominant allele of a different gene and spotted pattern (s) is recessive. A solid black male is mated with a solid red female which produces a litter of 6 pups- 2 solid black, 2 solid red, one black and white (spotted) and one red and white (spotted). Determine the genotypes of the parents. Show your work and/or explain your logic.

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5. a. Black coat color in Cocker Spaniels is governed by a dominant allele (B) and red coat
color (b) by a recessive allele. Solid pattern (S) is governed by the dominant allele of a
different gene and spotted pattern (s) is recessive. A solid black male is mated with a
solid red female which produces a litter of 6 pups- 2 solid black, 2 solid red, one black
and white (spotted) and one red and white (spotted). Determine the genotypes of the
parents. Show your work and/or explain your logic.
b. A dominant gene A causes yellow color in rats. The dominant allele of another gene, R,
produces black coat color. When the two dominants occur together (A_R_), they interact
to produce grey. Rats with the genotype aarr are cream-colored. If a grey male and a
yellow female are mated and produce 3 grey, 3 yellow, 1 cream and 1 black offspring,
Determine the genotypes of the parents. Show your work and/or explain your logic.
C. One gene for coat color in cats is sex-linked (X chromosome). The dominant allele (G)
produces a yellow coat color, the recessive allele (g) produces a black coat color and the
heterozygous condition produces tortoise shell color. Give the sex and coat colors of all
possible offspring resulting from the mating of a black male with a tortoise shell female.
Show your work.
Transcribed Image Text:5. a. Black coat color in Cocker Spaniels is governed by a dominant allele (B) and red coat color (b) by a recessive allele. Solid pattern (S) is governed by the dominant allele of a different gene and spotted pattern (s) is recessive. A solid black male is mated with a solid red female which produces a litter of 6 pups- 2 solid black, 2 solid red, one black and white (spotted) and one red and white (spotted). Determine the genotypes of the parents. Show your work and/or explain your logic. b. A dominant gene A causes yellow color in rats. The dominant allele of another gene, R, produces black coat color. When the two dominants occur together (A_R_), they interact to produce grey. Rats with the genotype aarr are cream-colored. If a grey male and a yellow female are mated and produce 3 grey, 3 yellow, 1 cream and 1 black offspring, Determine the genotypes of the parents. Show your work and/or explain your logic. C. One gene for coat color in cats is sex-linked (X chromosome). The dominant allele (G) produces a yellow coat color, the recessive allele (g) produces a black coat color and the heterozygous condition produces tortoise shell color. Give the sex and coat colors of all possible offspring resulting from the mating of a black male with a tortoise shell female. Show your work.
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