What is the cause of Down syndrome?
A) an extra chromosome on the 21st pair
B) an extra X chromosome on the 23rd pair
C) neurotransmitter excesses
D) neurotransmitter deficiencies

Question

Quizplus · Accepted Answer

Down syndrome is caused by the presence of an extra chromosome on the 21st pair, resulting in a total of 47 chromosomes instead of the typical 46. This extra genetic material can lead to developmental and intellectual delays, characteristic facial features, and other health problems.

What Is the Cause of Down Syndrome