The pleiotropic disease phenylketonuria, which occurs in humans is caused by a single mutation in the gene that codes for the enzyme.

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Tyrosinase

Phenyl pyruvate kinase

Phenyl alanine hydroxylase

Carboxy dismutase

answer is C.

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Detailed Solution

Phenylketonuria is caused by a single gene mutation in the gene which codes for phenylalanine hydroxylase. This manifests itself through phenotypic expression characterized by mental retardation and a reduction in hair and skin pigmentation.

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