If you were to breed a black male guinea pig to a brown female guinea pig in an attempt to determine which one was homozygous dominant and which one was homozygous recessive,how could you be certain that the guinea pigs are truly homozygous?
A)The guinea pigs would be homozygous for black (or brown)coat color if each strain could be bred for many generations and only black- (or brown-)colored offspring were produced.
B)If the immediate parents of the black (or brown)guinea pigs were both of that color,it proves they are homozygous.
C)If a cross between the black and brown guinea pig produced three black and one brown offspring,the black guinea pig would have to be homozygous for black coat color.
D)If a cross between the black and brown guinea pig produced four all black offspring,this would prove the black guinea pig was recessive.
E)Only microscopic examination of the guinea pig's genes could absolutely confirm homozygosity.

Question

Quizplus · Accepted Answer

Breeding the guinea pigs for many generations and consistently producing offspring with the same coat color would indicate that the guinea pigs are homozygous for that trait. This is because, after many generations of breeding, any heterozygous individuals would have produced both dominant and recessive offspring, resulting in a mix of coat colors in their descendants. Therefore, a consistent coat color in the offspring over many generations would suggest that the parents are homozygous. The other options do not provide as strong of evidence for homozygosity.

If You Were to Breed a Black Male Guinea Pig