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22 June, 10:06

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

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Answers (1)
  1. 22 June, 12:22
    0
    agouti - aaBbCc

    solid color - AaBBCC

    agouti black - AAbbCc

    albino - AaBbcc/Aabbcc/AABBcc

    Explanation: All the phenotypes that contain cc will be albinos, so they won't present any pigment deposition. Agouti black depends on the A gene to be homozygous and the B to be recessive, so the phenotype AAbbC_ is the correspondent. If A is not homozygous and B isn't recessive, we have agouti color. If B is homozygous and A recessive, we have a solid color.
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