Coat color in mice is determined by genes at two loci. When black mice from a particular population mate, they produce offspring in the following ratios 9 black 3 brown 4 white. These results suggest that white coat color is expressed as a result of
(A) dominance
(B) incomplete dominance
(C) codominance
(D) a sex-linked trait
(E) epistasis
Answer: E
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AP Biology
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