If blonde hair is dominant and designated as "B" and brunette hair is recessive and designated as "b," probability would predict that if a couple each with a "Bb" hair color genotype had four children, _____ would have blonde hair.

Question

Quizplus · Accepted Answer

When both parents are Bb, they each have one dominant blonde hair allele (B) and one recessive brunette hair allele (b). When they have children, each child randomly inherits one allele from each parent. Therefore, of their four children, statistically, three would be expected to have a dominant blonde hair allele from one of their parents, resulting in blonde hair. This means that the other child would inherit the recessive brunette hair allele from both parents, resulting in brunette hair. Therefore, the answer is C) 3.

If Blonde Hair Is Dominant and Designated as "B" and Brunette