The most common known hereditary cause of intellectual disabilities is
A)Fragile X syndrome.
B)Down syndrome.
C)Williams syndrome.
D)Prader-Willi syndrome.

Question

Quizplus · Accepted Answer

Fragile X syndrome is the most common known hereditary cause of intellectual disabilities. It is caused by a mutation on the X chromosome and is more common in males than females. Down syndrome and Williams syndrome are also genetic disorders that can cause intellectual disabilities but are not as common as Fragile X syndrome. Prader-Willi syndrome is a genetic disorder that can cause intellectual disabilities but it is not the most common cause.

The Most Common Known Hereditary Cause of Intellectual Disabilities Is