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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?

Question

Quizplus · Accepted Answer

The cross between a black female and a brown male resulting in 3 possible coat colors (all black, 1/2 black to 1/2 brown, and 3/4 black to 1/4 yellow) indicates that there are at least two genes responsible for coat color in Labrador retrievers. This is because the inheritance of a single gene would result in only two possible outcomes (black or brown) in a cross between a black and brown individual. Therefore, at least two genes must be responsible for the variation in coat color.

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