MEDizzy - Coat colour in Labrador retriever is controlled by

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metabolism - Set 3

Coat colour in Labrador retriever is controlled by epistasis. B specifies black pigment, b is for brown pigment (recessive) and E locus determines the expression of B locus. Which one of the following is wrong?

ExplanationAccording to the rules of recessive epistasis, at least one dominant allele at the E locus is needed for expression at the b locus. As in option bb EE gives yellow the E locus is dominant so b locus is expressed to give chocolate or brown colour not yellow.