The Classical Form of the Metabolic Disease Phenylketonuria Is Caused

question 9

Multiple Choice

The classical form of the metabolic disease phenylketonuria is caused by a mutation in the gene encoding the enzyme phenylalanine hydroxylase (PAH) , which converts phenylalanine to tyrosine.A variant form of phenylketonuria is caused by a mutation in a separate gene that encodes a different enzyme involved in the synthesis of a cofactor needed for PAH to function.Which of the following phenomena is illustrated by these two forms of phenylketonuria?

• A)Allelic heterogeneity
• B)Compound heterozygosity
• C)Locus heterogeneity
• D)Anonymous polymorphism

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