Question

Two independently assorting loci, c and a, control coat color in mice. The
mice which are homozygous for recessive c cannot synthesize pigment, and
thus have white hair (albino). Homozygous aa mice have completely black
hair. Locus a is involved in pigment production, because in the case of aa,
melanin is distributed throughout the hair; but, when the dominant allele A
is present, the melanin only goes to parts of the hair, resulting in a grayish
coat called agouti. This color, however, cannot occur when the mice have the
albino alleles cc regardless of what a alleles are present.
A black mouse of genotype CcAa is crossed to a white one of Ccaa genes.
a. What is the phenotypic ratio for F1 ?
b. F2
c. What epistatic interaction operates in the given situation?​

Answer 1

Answer:

Hi there!!

Explanation:

Happy helping...

a) Phenotypes of F1 is :

• CCAa agouti
• CCaa Black
• CcAa agouti
• Ccaa black
• ccAa albino
• ccaa albino

so the ratio comes out to be 1:1:1

b) I am not sure about this qn...forgive me. I dont want to give you a wrong answer.

c) It is supplementary gene and recessive epistasis.