Phenylketonuria Is an Inherited Disease Caused by a Recessive Autosomal

question 2

Multiple Choice

Phenylketonuria is an inherited disease caused by a recessive autosomal allele. If a woman and her husband are both carriers, what is the probability that their first child will be a phenotypically normal girl?

• A) 1.0
• B) 3/8
• C) 3/16
• D) 1/4
• E) 1/16

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Definitions:

Early Signs

Initial indicators or symptoms that may suggest the development or presence of a disease or condition.

Experimental Study

A study method that involves manipulating variables to determine cause and effect relationships.

Cure Rates

The percentage of people who are considered completely free of a particular disease after undergoing treatment.

Double-Masked Design

Experimental procedure in which neither the participant nor the experimenter knows whether the participant has received the experimental treatment or a placebo.