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.

agouti
solid color
solid color
agouti black
albino

aabbcc
aabbcc
aabbcc

aabbcc
aabbcc
aabbcc