The Punnett square shows alleles for hairline type among one parent and the possible allele frequencies among the children. The dominant form of this trait is a widows peak (P), and the recessive form is a straight hairline. The alleles for one parent are missing. Punnett Square for Hairline TypePpPpppPpppWhat are the alleles for the missing parent?
The offspring combinations shown are Pp and pp, each appearing twice. One parent contributes either P or p, while the other must contribute p every time. Therefore, the missing parent’s alleles are pp, which is choice B.
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