Which hereditary cause of intellectual disability affects male children at a rate of about 1 out of every 3800 males with up to three-fourths of individuals with this disorder also suffering from hyperactivity and attention disorders?
A) hydrocephaly
B) cretinism
C) phenylketonuria (PKU)
D) fragile X syndrome

Question

Quizplus · Accepted Answer

Fragile X syndrome is an X-linked hereditary disorder that affects males at a rate of about 1 out of every 3800. Up to three-fourths of individuals with this syndrome also suffer from hyperactivity and attention disorders. Hydrocephaly is a condition characterized by an abnormal accumulation of cerebrospinal fluid in the brain. Cretinism is a type of intellectual disability caused by severe iodine deficiency during fetal development. Phenylketonuria (PKU) is an autosomal recessive disorder that can cause intellectual disability if left untreated, but it does not have a higher incidence in males.

Which Hereditary Cause of Intellectual Disability Affects Male Children at a Rate