You notice that both of your parents have a widow's peak that is determined by the dominant allele W. You however, have a straight hairline, which is a homozygous recessive condition (ww). What are the possible genotypes of your parents?
A)ww and ww
B)WW and WW
C)Ww and Ww
D)WW and Ww

Question

Quizplus · Accepted Answer

Since you have a straight hairline (ww), both of your parents must carry at least one recessive allele (w) to pass on to you. The only option that allows both parents to have a widow's peak (dominant trait) while still being able to pass on a recessive allele to you is if both are heterozygous (Ww).

You Notice That Both of Your Parents Have a Widow's