Question

In humans the allele for albinism is recessive to the allele for normal skin pigmentation. If two parents are heterozygous, what is the parents genotype?

Answer 1

If both parents are heterozygous (Ww), there is a 75% chance that any one of their offspring will have a widow's peak (see figure). A Punnett square can be used to determine all possible genotypic combinations in the parents.