Question

A pet store has two guinea pigs. One has white fur and one has black fur. The white guinea pig has two recessive alleles for fur color (bb) The black guinea pig has one dominant allele (B) and one recessive allele (b) for fur color. What will most likely be the phenotypes of the offspring in a cross between the two Guinea pigs? Explain your answer

Answer 1

Half of the Guinea pigs will be white, half will he black.

Using a Punnet Square to crossbreed Bbxbb, we find that all possible genotypes include: Bb, and Bb, bb, and bb. Since we know that a heterozygous Bb Guinea pig will be black, we can safely say that half of the offspring will be black, half will be white.