Down syndrome is linked to
A) alcohol abuse by the father.
B) abnormalities of the 21st pair of chromosomes.
C) sex-linked chromosomal abnormalities.
D) the teratogenic effects of contracting rubella during pregnancy.

Question

Quizplus · Accepted Answer

Down syndrome is caused by an extra copy of chromosome 21 (trisomy 21), which is an abnormality of the 21st pair of chromosomes, not related to alcohol abuse, sex-linked chromosomal abnormalities, or the effects of rubella during pregnancy.

Down Syndrome Is Linked to