Down syndrome can occur
A)as a result of translocation during mitosis.
B)because of nondisjunction, which yields an extra chromosome.
C)most frequently in the offspring of women under the age of 40.
D)all of the above.

Question

Quizplus · Accepted Answer

Down syndrome is most commonly caused by nondisjunction during meiosis, leading to an extra chromosome 21. It is not typically associated with translocation during mitosis, and it occurs more frequently in the offspring of older women, particularly those over 35.

Down Syndrome Can Occur