An individual has PKU.Which of the following must be true?
A) His biological parents must both have had PKU.
B) At least one of his biological parents must have had PKU.
C) At least one of his biological parents must have been a carrier for PKU.
D) Each of his parents must have either been a carrier for, or had, PKU.

Question

Quizplus · Accepted Answer

Phenylketonuria (PKU) is an autosomal recessive genetic disorder, meaning that an individual must inherit two copies of the defective gene, one from each parent, to have the condition. Therefore, each parent must either be a carrier of the PKU gene (having one copy of the defective gene) or have PKU themselves (having two copies of the defective gene).

An Individual Has PKU