Lab: Mouse Genetics (One Trait) Answers

In the cross Bb x Bb (two heterozygous mice), what percentage of the offspring would you predict to have the same phenotype as the parents?

Suppose that you had a male mouse with black eyes and a female mouse with red eyes. You know that the allele for black eyes is dominant, and you want to determine whether the male is heterozygous.

way that this can happen is if their genotypes are both bbBBBb.

Therefore, both parents pass the Bbbb allele to every offspring.

When you combine two of these alleles, the resulting genotype is bbBBBb; therefore, the resulting offspring have white fur.