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. Allele 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? dominant and recessive epistasis O dominant epistasis O duplicate recessive epistasis O recessive epistasis duplicate dominant epistasis

Answer 1

Epistasis is the interaction between genes that influences a phenotype. Genes can either mask each other so that one is considered “dominant” or they can combine to produce a new trait. Dominant epistasis happens when the dominant allele of one gene masks the expression of all alleles of another gene. When it is a recessive allele that masks the expression, it is called recessive epistasis.

a) dominant and recessive epistasis