Biology - Principles of Inheritance and Variation Question with Solution | TestHub

The genotype of the man is $WW$ (homozygous dominant for widow's peak).

The genotype of the woman is $ww$ (homozygous recessive for straight hairline).

A cross between the parents ($WW\times ww$) will produce offspring that all have the genotype $Ww$ (heterozygous).

Since the allele for widow's peak ($W$) is dominant over the allele for straight hairline ($w$), all offspring will exhibit the widow's peak phenotype.

Therefore, the percentage of offspring inheriting a straight hairline is $0\%$.

Answer: $0\%$