An inherited metabolic disorder called phenylketonuria (PKU) can result in serious problems in infancy. The chance that two parents who are heterozygous will have a child with PKU is 25%.Which of the following terms best applies to the inheritance pattern for PKU?

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PKU is an autosomal recessive disorder, meaning that a child must inherit two copies of the faulty gene (one from each parent) to exhibit the disease. Parents who are heterozygous (carrying one normal allele and one PKU allele) have a 25% chance of having a child with PKU if both pass on the PKU allele.

An Inherited Metabolic Disorder Called Phenylketonuria (PKU) Can Result in Serious