Epistasis can be illustrated by the example of the coat of mice. The brown coat is obtained by the “A” allele and the black coat is obtained by the “a” allele. However, for both colors, another gene (C locus) is required. If the “C” allele allows the deposition of the pigment, then it is recessive epistasis (a mouse with the “c” allele is white). If the “c” allele allows the deposition of the pigment, then it is epistasis dominant (a mouse with the “C” allele is white).
Suppose the coat of mice is complementation epistasis, which of the following would be true about phenotypes:
A. The mice would be white, brown or black in equal proportions.
B. The white phenotype will never be expressed.
C. The brown phenotype will never be expressed.
D. The black phenotype will never be expressed.
E. The mice would be brown or black with the 9: 7 ratio respectively.
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