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In mice, the A y allele of the agouti gene is a recessive lethalallele, but it is also dominant for coat color. What phenotype andratios would you expect from the cross of a mouse heterozygous atthe agouti locus (genotype A y A) and also at the albino locus (Cc)to an albino mouse (cc) homozygous at the agouti locus (A y A)?

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Deanna Hettinger
Deanna HettingerLv2
28 Sep 2019
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Related questions

Pigment in mouse fur is only produced when the C allele is present. Individuals of the cc genotype are white. If color is present, it may be determined by the A, a alleles. AA or Aa results in agouti color, while aa results in black coats. What are the phenotypic ratios in the F2 generation of mice if an AACC parent and an aacc parent are bred to yield F1 mice which are then crossed to generate an F2 generation? Enter your answer as a fraction in the blank next to the appropriate coat color.

agouti

colorless

black

In cats, there is a gene that produces ticked fur (bands ofdifferent colors on each hair} called agouti (H). The recessiveallele (h) for this gene produces hair that is solid color from endto end. In addition there is another coat color gene that hasrecessive albino allele (a) that prevents the production of anycoat color pigment in the homozygous recessive genotype. These 2genes are unlinked (on diferent chromosomes). An albino female catis mated to a solid brown male cat. All of their offspring areagouti. The males and females among these offspring are allowed tofreely 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 furcolor among the F2 kittens (Show your work)

Thanks!

In the same mouse species, a fourth unlinked gene (gene P/p) alsoaffects fur color.
For mice that are either homozygous dominant (PP) or heterozygous(Pp), the organism’s fur color is dictated by the other three genes(A/a, B/b, and C/c).
For mice that are homozygous recessive (pp), large patches of theorganism’s fur are white. This condition is calledpiebaldism.


In a cross between two mice that are heterozygous for agouti,black, color, and piebaldism, what is the probability thatoffspring will have solid black fur along with large patches ofwhite fur?

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