In humans, the allele for a widow’s peak is dominant to the allele for a straight hairline. in a family with three children, two of the children have a straight hairline and one child has a widow’s peak. which of the following is possible?
a. both parents are homozygous for a straight hairline.
b. both parents are homozygous for a widow’s peak.
c. one parent is homozygous for a straight hairline, and the other is heterozygous.
d. one parent is homozygous for a widow’s peak, and the other is homozygous for a straight hairline.