In labrador retrievers, coat color is controlled by two loci each with two allel

Question

In labrador retrievers, coat color is controlled by two loci each with two alleles B,b and E, e respectively. When a pure breeding black lab with genotype BBEE are crossed with pure breeding yellow labs of genotype bbee the resulting F1 offspring are black.
When a test-cross is done using the F1 (BbEe) to a double homozygous recessive (bbee) individual, breeders typically get the following phenotypic ratios:
1 Black lab, 1 chocolate lab, 2 yellow labs

QUESTION IS: Why type of inheritance pattern is being discussed?

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Explanation / Answer

Epistasis, which is the interaction of two or more genes that controls a single phenotype, in this case, coat color in Labrador Retrievers.

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