Intellectual disabilities are classified by origin. Which term best describes the cause of Down syndrome and Fragile X syndrome?
A) perinatal
B) prenatal
C) genetic
D) postnatal

Question

Quizplus · Accepted Answer

Down syndrome and Fragile X syndrome are caused by genetic abnormalities. Down syndrome is typically caused by an extra copy of chromosome 21, while Fragile X syndrome is caused by a mutation in the FMR1 gene on the X chromosome.

Intellectual Disabilities Are Classified by Origin