Question

In mice, the presence of a dominant A allele results in the agouti pattern of fur color, whereas the aa homozygous recessive results in a solid color pattern. The presence of another dominant B allele results in black fur color, whereas the homozygous recessive bb results in brown fur color. The presence of a third dominant C allele is required for any color to be observed (brown or black), whereas the homozygous recessive cc results in lack of any color whatsoever (albino). What is the phenotype of a mouse with the following genotype?

Answer 1

Answer:

Although no genotype is given in the question, the answer may vary, depending on which genes are available:

Genotype _ _| _ _| c c (phenotype: albino).

Genotype A_B_C_ (phenotype: agouti, black).

Genotype A_bb_C_ (phenotype: agouti, brown).

Genotype aa_Bb_C_ (phenotype: solid, black).

Genotype aa_bb_C_ (phenotype: solid, brown).

Explanation:

Based on the information give, the AA and Aa genotypes produce the agouti color pattern, whereas the aa genotype results in a solid color pattern.

The BB and Bb genotypes result in black fur color, while bb results in brown fur color.

The CC and Cc genotypes turn on the color in the other pairs of genes. Meanwhile, the cc genotype prevents any colors to be shown, or it leads to albino.

Here, we have three pairs of alleles (_ _| _ _| _ _), represented by six underlines. The first, second and third two underlines respectively show the loci of the pair of alleles that results in agouti color vs solid color, black vs brown color, and any color of the first two pairs to be shown vs not to be shown (albino).

Whenever cc is available, the mice with the genotype _ _| _ _| c c has the albino phenotype.

The mice with the A_B_C_ genotype has the agouti, black phenotype.

The mice with the A_bb_C_ genotype has the agouti, brown phenotype.

The mice with the aa_Bb_C_ genotype has the solid, black phenotype.

The mice with the aa_bb_C_ genotype has the solid, brown phenotype.