Which of the following is a genetic disease in which a child lacks an important enzyme and which results in a severe intellectual disability by age three,if left untreated?
A) phenylketonuria (PKU)
B) fragile X syndrome
C) Down syndrome
D) cretinism

Question

Quizplus · Accepted Answer

Phenylketonuria (PKU) is a genetic disease in which a child lacks an important enzyme that breaks down an amino acid called phenylalanine. As a result, phenylalanine can build up in the body and cause severe intellectual disability by age three if left untreated.

Which of the Following Is a Genetic Disease in Which