In cats, there is a gene that produces ticked fur (bands of different colors on

Question

In cats, there is a gene that produces ticked fur (bands of different colors on each hair} called agouti (H). The recessive allele (h) for this gene produces hair that is solid color from end to end. In addition there is another coat color gene that has recessive albino allele (a) that prevents the production of any coat color pigment in the homozygous recessive genotype. These 2 genes are unlinked (on diferent chromosomes). An albino female cat is mated to a solid brown male cat. All of their offspring are agouti. The males and females among these offspring are allowed to freely interbreed, producing a litter of F2 kittens.

(a) What is the genotype of the albino female cat?

(b) What is the genotype oif the solid brown male cat?

(c) What is the genotype of their agouti offspring?

(d) What is the phenotypic ratio of the F2 kittens?

(e) Use a Punnett square to predict the phenotypic ratio for fur color among the F2 kittens (Show your work)

Thanks!

Explanation / Answer

a. Female albino: aa_ _ is crossed with Male solid brown cat: A _ hh.

As all the offspring are agouti, we can clearly say, genotype of female albino cat is aaHH.

b. Genotype of solid brown male cat: AAhh.

c. Genotype of agouti offspring will be AaHh ( a: from mother, h: from father, A: from father, H: as offspring is agouti).

d. 9 :3 :3 :1.

e. AaHh x AaHh

If you proceed with the cross, the result will be:

9 (agouti) :3 (solid brown) :3 (albino) :1 (albino).

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