In mice, agouti fur is a dominant trait resulting in individual hairs having a l

Question

In mice, agouti fur is a dominant trait resulting in individual hairs having a light band of pigment on an otherwise dark hair shaft. A mouse with agouti fur is shown here, along with a mouse with solid color fur, which is the recessive phenotype (A = agouti; a = solid color).

A litter of mice from the mating of two agouti black parents includes offspring with the following fur colors:

In the same mouse species, a third unlinked gene (gene C/c) also has an epistatic effect on fur color. The presence of the dominant allele C (for color), allows the A/a and B/b genes to be expressed normally. The presence of two recessive alleles (cc), on the other hand, prevents any pigment from being formed, resulting in an albino (white) mouse.

Match the phenotypes on the labels at left to the genotypes listed below. Labels can be used once, more than once, or not at all.

Label - Albino, Agouti brown, Sold color black, Agouti black, Solid color brown.

AaBbcc - ?

AaBBCC -?

Aabbcc -?

AAbbCc -?

aaBbCc -?

AABBcc-?

In the same mouse species, a fourth unlinked gene (gene P/p) also affects fur color.

Explanation / Answer

A) 3/16

B) 2/3

C)

AaBbcc-Albino,
AaBBCC-Agouti Black
Aabbcc-Albino
AAbbCc Agouti Brown
aaBbCc-Solid color, Black
AABBcc-Albino

D) 9/256

Source: Mastering Bio

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