iGenetics 3rd Edition by Peter Russell

Exercise 3

Phenylketonuria (PKU) is an inherited human metabolic disorder whose effects include severe mental retardation and death. This phenotypic effect results from
A) the accumulation of phenylketones in the blood.
B) the absence of phenylalanine hydroxylase.
C) a deficiency of phenylketones in the blood.
D) a deficiency of phenylketones in the diet.