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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.
-In one type cross of black × black, the results were as follows: 9/16 black
4/16 yellow
3/16 brown
The genotype aabb must result in which of the following?

Question

Quizplus · Accepted Answer

The genotype aabb is associated with the yellow color in Labrador retrievers. This means that both alleles for black (A) are absent, and both alleles for brown (B) are absent, leaving only the alleles for yellow (bb).

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