Down syndrome is the result of
A)improper crossing over.
B)nondisjunction.
C)improper implantation.
D)incomplete capacitation.
E)disassociation.

Question

Quizplus · Accepted Answer

Down syndrome is caused by the presence of an extra copy of chromosome 21, which results from nondisjunction during meiosis (the failure of the chromosomes to separate properly). This extra chromosome leads to the characteristic physical and intellectual impairments associated with the syndrome.

Down Syndrome Is the Result of