A widow's peak is a V-shaped area of the hairline in the center of the forehead. The allele for having a widow's peak is dominant to the allele for not having a widow's peak.
If two parents do not have widow's peaks, what is the probability that their child will have a widow's peak?
It depends on whether or not the parents are heterozygous for the trait. if they both are, then the child will have a 75% chance of having a widows peak.
