Which of the following disorders is character | vedclass

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(D) Phenylketonuria $(PKU)$ is an inborn error of metabolism that is inherited as an autosomal recessive trait.In this disorder,the affected individua

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Phenylketonuria

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(D) Phenylketonuria $(PKU)$ is an inborn error of metabolism that is inherited as an autosomal recessive trait.In this disorder,the affected individual lacks the enzyme phenylalanine hydroxylase,which converts the amino acid phenylalanine into tyrosine.As a result,phenylalanine accumulates and is converted into phenylpyruvic acid and other derivatives.Accumulation of these substances in the brain results in mental retardation.Other symptoms include reduction in hair and skin pigmentation.

Which of the following disorders is characterized by mental retardation?

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