Hair Color Is Determined in Labrador Retrievers by Alleles at the B

question 80

Multiple Choice

Hair color is determined in Labrador retrievers by alleles at the B and E loci. A dominant allele B encodes black pigment, whereas a recessive allele b encodes brown pigment. Alleles at a second locus affect the deposition of the pigment in the shaft of the hair; dominant allele E allows dark pigment (black or brown) to be deposited, whereas recessive allele e prevents the deposition of dark pigment, causing the hair to be yellow.
-What type of gene interaction does this represent?

• A) recessive epistasis
• B) dominant epistasis
• C) duplicate recessive epistasis
• D) duplicate dominant epistasis
• E) dominant and recessive epistasis

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