Question

If a couple are both heterozygous for brown eyes, what is the probability of them having a blue eyed child? 50% 0% 25% 100% 75%

Answer 1

Let’s say that the alleles are B’s. The alleles are different, so it would be Bb. Cross two of them to get BB, Bb, Bb, and bb. Blue eyes are homozygous recessive, or bb. There is a 1 in 4 chance of having a blue eyed child, or 25%.