Question

Labrador retrievers' fur color is controlled by two alleles, E and B. Any dog with the ee_ genotype d evelops into a yellow lab, while B_E_ dogs become black labs and bbE_ dogs become chocolate labs. This is an example of __ .

Answer 1

This is an example of recessive epistasis.

Here the presence of recessive allele ee at one locus inhibits the phenotypic effect of genes at the B locus.

As it is mentioned in the question above the ee__ genotype develops into a yellow lab.  

Dominant B gene can produce the black coat color phenotype only when a dominant allele E is also present.

If the genotype is B_ee, then yellow coat color would be produced.  

Therefore the recessive allele e  in homozygous ee form masks the effect of the dominant  B allele.

Recessive epistasis is the phenomenon in which the expression of one gene pair is depending on some other gene pair. In different words, one gene must be grown to become one for any other gene to be expressed.

Learn more about recessive epistasis here brainly.com/question/25217589

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