____ is the most common form of intellectual disability resulting from chromosomal abnormalities.
A) Klinefelter's syndrome
B) Fragile-X syndrome
C) Down syndrome
D) Prader-Willi syndrome

Question

Quizplus · Accepted Answer

Down syndrome is caused by the presence of an extra copy of chromosome 21, resulting in a total of 47 chromosomes instead of the typical 46. It is the most common chromosomal abnormality and the most common genetic cause of intellectual disability. Klinefelter's syndrome, Fragile-X syndrome, and Prader-Willi syndrome are also associated with intellectual disability, but they are caused by different genetic abnormalities.

____ Is the Most Common Form of Intellectual Disability Resulting