Recessive epistasis due to the yellow coat mutation
Figure 6-17: Three different coat colors in Labrador retrievers. Two alleles B and b of a pigment gene determine (a) black and (b) brown, respectively. At a separate gene, E allows color deposition in the coat, and e/e prevents deposition, resulting in (c) the gold phenotype. Part c illustrates recessive epistasis.
[Anthony Griffiths.]
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