Imagine that we mate two black Labrador dogs with normal vision and find that three of the puppies are like the parents,but one puppy is chocolate with normal vision and another is black with PRA (progressive retinal atrophy,a serious disease of vision).We can conclude that

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Quizplus · Accepted Answer

The fact that one puppy is chocolate with normal vision and one is black with PRA indicates that the alleles for coat color and vision are segregating independently, and not on the same chromosome. The parents do not necessarily have to be homozygous for both traits, and there is no evidence to suggest that the alleles for coat color and PRA are linked or affect each other.

Imagine That We Mate Two Black Labrador Dogs with Normal