Down syndrome can often be traced to ________.
A) a defect in the shape of the uterus
B) a defect in the mother's egg cell
C) exposure to lead
D) maternal depression

Question

Quizplus · Accepted Answer

Down syndrome is most commonly caused by a defect in the mother's egg cell, where there is an extra copy of chromosome 21. This is known as trisomy 21. The other options listed are not associated with the development of Down syndrome.

Down Syndrome Can Often Be Traced to ________