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?

Answer 1

If both parents do not have widow's peaks, they would both have the recessive allele for not having a widow's peak (let's represent this as ww). Since the allele for having a widow's peak (W) is dominant, both parents would be ww.

When they have offspring, all of their children will inherit one recessive allele for not having a widow's peak from each parent. Therefore, the child's genotype would be ww. Since the child does not have the dominant allele for having a widow's peak, the child will not have a widow's peak.

Therefore, the probability that their child will have a widow's peak is 0%.