Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

Phenylketonuria is an inborn error of metabolism where the individual has reduced metabolism of the amino acid phenylalanine. Mutation in the gene causes inhibition of the production of enzyme phenylalanine hydroxylase that converts phenylalanine into tyrosine. Such mutation leads to mental retardation, with reduction in hair and skin pigmentation. It is a recessive autosomal disorder.