Imagine That We Mate Two Black Labrador Dogs with Normal

Multiple Choice

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

A) the same alleles that control coat color can also cause PRA.
B) the alleles for color and vision segregate independently during gamete formation.
C) both of the parents are homozygous for both traits.
D) the alleles for color and vision segregate dependently during gamete formation.