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Labrador retrievers are black, brown, or yellow. In a cross of a black female with a...

Labrador retrievers are black, brown, or yellow. In a cross of a black female with a brown male, results can be all black puppies, 1/2 black to 1/2 brown puppies, or 3/4 black to 1/4 yellow puppies. What is/are the genotype(s) that results in the black phenotype, brown phenotype, and yellow phenotype?

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