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Labrador retrievers are black, brown, or yellow. In a cross of a black female with a brown male, results can be either all black puppies, 1/2 black to 1/2 brown puppies, or 3/4 black to 1/4 yellow puppies.
-How many genes must be responsible for these coat colors in Labrador retrievers?
A) 1
B) 2
C) 3
D) 4
E) 5

Question

Quizplus · Accepted Answer

The inheritance of coat color in Labrador retrievers is determined by two genes: one gene controls the production of black pigment, and the other gene controls the production of brown pigment. The yellow color is a result of a modification in the expression of the genes that produce the black pigment. Therefore, the combination of alleles on these two genes determines the coat color of Labrador retrievers.

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