A gene on chromosome 12 codes for an enzyme called phenylalanine hydroxylase. A

Question

A gene on chromosome 12 codes for an enzyme called phenylalanine hydroxylase. A dysfunctional form of the gene exists in human populations. People who can’t produce this enzyme have the PKU allele and may suffer from a disease called PKU. Given this information, which of the following statements is most likely true?

A. Males are more likely than females to be born with PKU.

B. The PKU allele is categorized as a recessive allele.

C. People need two functional copies of the gene in order to make enough of the enzyme.

D. Among people with PKU, the dysfunctional form of the gene is only found in the stomach cells.

Explanation / Answer

The corret answer is B-The PKU allele is categorized as a recessive allele.

PKU is the result of the mutation in PAH gene. Mutation in that particular gene results in the low formation of phenylalanine hydroxylase enzyme. PKU is an autosomal recessive disorder in which both the copies of the genes are mutated in order to develop the deficiency.

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