Two Parents Are Phenotypically Normal, but One of Their Four

question 42

Multiple Choice

Two parents are phenotypically normal, but one of their four biological children has a typical autosomal recessive trait. The other three children are phenotypically normal. It is very likely that:

• A) the affected child is a girl.
• B) the affected child is a boy.
• C) the trait was expressed by one of the grandparents of the children.
• D) the parents are both heterozygous for the trait.
• E) if the affected child eventually marries a phenotypically normal spouse, all of their children will have the trait.

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