Question

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

Answer 1

Answer:

D

Explanation:

duplicate dominant epistasis will occur whenever a dominant allele of one gene masks the expression of all alleles of other gene. It can be said that if an organism inherits one or two copies of the dominant allele, they will have the trait.