In humans, widow's peak (W) is dominant over straight hairline (w). If a heterozygous male marries a female with a straight hairline, what percent of their children can be expected to have widow's peak?
A) 0%
B) 25%
C) 50%
D) 100%
E) The answer cannot be determined by the information given.

Question

Quizplus · Accepted Answer

The heterozygous male has one dominant allele (W) and one recessive allele (w), so he can pass on either allele to his offspring with equal probability. The female has two recessive alleles (ww). Therefore, the possible genotypes of their offspring are: 
- 50% chance of inheriting one dominant and one recessive allele (Ww), resulting in a widow's peak
- 50% chance of inheriting two recessive alleles (ww), resulting in a straight hairline 
Thus, 50% of their children can be expected to have a widow's peak.

In Humans, Widow's Peak (W) Is Dominant Over Straight Hairline