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In breeding Labrador retrievers, yellow labs always have pink noses, and black labs always have black noses. What is a possible explanation for this occurrence?

A. Genetic mutation
B. Environmental factors
C. Parental gene dominance
D. Pure coincidence

Answer :

Final answer:

The occurrence where yellow Labrador retrievers always have pink noses and black labs always have black noses is explained by parental gene dominance and the genetic interaction known as epistasis.

Explanation:

In Labrador retrievers, the association between fur color and nose color can be explained by the genetic concept known as parental gene dominance. The genes that control fur color in Labradors also influence nose color - a phenomenon termed as epistasis, where one gene interacts with and affects the expression of another gene. Specifically, the alleles E and B control the fur color. Yellow labs develop from the ee_ genotype, which always presents with a pink nose, while black labs, with the B_E_ genotype, always have black noses. This illustrates that the fur color trait is tightly linked to the nose color trait, likely due to the shared genetic pathways influencing pigment production in both the fur and the nose.

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