Phenylketonuria (PKU)is a disease in humans that results from the abnormal metabolism of the amino acid phenylalanine.If untreated,it can lead to severe brain damage in infants.Two normal parents have a child who has PKU.What can you determine about the inheritance of the PKU allele from this information?

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Quizplus · Accepted Answer

The fact that two normal parents have a child with PKU indicates that the PKU allele is recessive, as both parents must have been carriers (heterozygous) for the allele in order for their child to inherit two copies and express the disease.

Phenylketonuria (PKU)is a Disease in Humans That Results from the Abnormal