In humans, assume straight hairline is recessive to widow's peak. A woman with a straight hairline is married to a man with a widow's peak whose mother had a straight hairline. What are the chances of the couple having a child with a straight hairline?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%

Question

Quizplus · Accepted Answer

The man must be heterozygous (Ww) because he has a widow's peak (dominant trait) but his mother had a straight hairline (recessive trait). The woman is homozygous recessive (ww) for a straight hairline. The possible genotypes for their children are Ww (widow's peak) and ww (straight hairline), giving a 50% chance for a straight hairline.

In Humans, Assume Straight Hairline Is Recessive to Widow's Peak