One of the most frequently occurring recessive disorders is
A) phenylketonuria.
B) Huntington disease.
C) Marfan syndrome.
D) Down syndrome.

Question

Quizplus · Accepted Answer

Phenylketonuria (PKU) is a common autosomal recessive disorder caused by a deficiency in the enzyme phenylalanine hydroxylase, which results in the accumulation of phenylalanine and its byproducts. PKU can cause intellectual disability, seizures, and other neurological problems if not treated early with a low-phenylalanine diet. Huntington disease (B) is an autosomal dominant disorder, while Marfan syndrome (C) is a genetic disorder caused by mutations in the FBN1 gene and is inherited in an autosomal dominant manner. Down syndrome (D) is a chromosomal disorder caused by the presence of an extra copy of chromosome 21 and is not inherited in the classical sense.

One of the Most Frequently Occurring Recessive Disorders Is