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Unformatted text preview: Several of the pigment genes are subject to epistasis. The gene to distribute pigment is overridden by a second gene that blocks (inhibits) pigment production. Examples: Mice can have black or brown pigmented fur depending on the inheritance of a gene for pigmentation. Black is dominant and brown, recessive. A second, independent gene prevents the distribution of any pigment in the fur. This gene, when recessive, results in white mice. In corn, expression of the pigment gene is also controlled by an epistatic gene. Epistatic genes can vary in how they control, resulting in different patterns and inheritance ratios as shown in the diagrams. In corn, distribution of pigment requires the epistatic dominant allele....
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.
- Spring '10