Question

A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the

recessive color

Answer 1

When a homozygous dominant brown mouse is crossed with a heterozygous brown mouse, the phenotypic ratio of the offspring will be 1 brown:1 tan.

Step-by-step explanation:

In mice, the coat color is determined by two genes: A gene for agouti coat color and a gene for pigment production. The agouti coat color (A) is dominant to solid coloration, such as black or gray. The pigment production gene (C) is necessary for pigment production. The recessive allele c does not produce pigment, resulting in an albino phenotype regardless of the allele at the A locus. When a homozygous dominant brown mouse (AA) is crossed with a heterozygous brown mouse (AaCc), the phenotypic ratio of the offspring will be 1 brown:1 tan.