A couple has three children, two of which have blonde hair. The third child and both parents have dark hair. What can be determined about the gene for hair color in this family?
A) Blonde hair color is an autosomal recessive trait.
B) Blonde hair color is an autosomal dominant trait.
C) Blonde hair color is a sex-linked dominant trait.
D) Blonde hair coloris a sex-linked recessive trait.
E) Blonde hair colorconveys a lethal mutation.

Question

Quizplus · Accepted Answer

Blonde hair in this scenario is likely an autosomal recessive trait because both parents have dark hair but can still have children with blonde hair, indicating they are carriers of the recessive blonde hair allele. Autosomal dominant traits would not allow two dark-haired parents to have a blonde child, and sex-linked traits have different inheritance patterns not described here. There's no indication that blonde hair is lethal.

A Couple Has Three Children, Two of Which Have Blonde