The genetic disease caused by the absence of an enzyme that breaks down phenylalanine is:

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Phenylketonuria (PKU) is an autosomal recessive disorder due to deficiency of phenylalanine hydroxylase, leading to accumulation of phenylalanine, causing mental retardation if untreated. Albinism is tyrosinase deficiency, sickle cell HbS mutation, cystic fibrosis CFTR defect.

The genetic disease caused by the absence of an enzyme that breaks down phenylalanine is: MCQ with Answer and Explanation

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