If an infant inherits the gene for PKU,and it is left untreated,the result will be

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If an infant inherits the gene for PKU (phenylketonuria) and it is left untreated, the result will be mental retardation. PKU is a genetic disorder that prevents the body from properly processing an amino acid called phenylalanine, which then builds up in the body and causes brain damage if left untreated. The only treatment for PKU is a strict low-phenylalanine diet, which must be started early in life to prevent brain damage and mental retardation.

If an Infant Inherits the Gene for PKU,and It Is