The figure shown indicates two Labrador retrievers that are both homozygous recessive for fur color. Why is one dog brown and the other is yellow?

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The figure suggests that the Labrador retrievers are both homozygous recessive for fur color. However, there are other genes that determine fur color, and these genes interact with each other in a process called epistasis. One of these genes affects the production of melanin, which is responsible for the color of the fur. In this case, the gene that produces melanin is interacting with the gene that codes for the recessive fur color, resulting in one dog having a brown coat and the other having a yellow coat.

The Figure Shown Indicates Two Labrador Retrievers That Are Both