Phenylketonuria is a genetic disorder of

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(D) Phenylketonuria $(PKU)$ is an inborn error of metabolism.It is caused by an autosomal recessive mutation of a gene located on chromosome $12$.This

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Autosomal recessive gene

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(D) Phenylketonuria $(PKU)$ is an inborn error of metabolism.It is caused by an autosomal recessive mutation of a gene located on chromosome $12$.This mutation leads to the deficiency of the enzyme phenylalanine hydroxylase,which is required to convert the amino acid phenylalanine into tyrosine.As a result,phenylalanine accumulates and is converted into phenylpyruvic acid and other derivatives,which leads to mental retardation.

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