Which of the following is an example of nondisjunction?
A)Fetal alcohol syndrome
B)Spina bifida secondary to maternal infection with rubella
C)Down syndrome
D)Twinning

Question

Quizplus · Accepted Answer

Nondisjunction is the failure of a pair of chromosomes to separate properly during meiosis, resulting in one daughter cell receiving an extra chromosome and the other daughter cell missing a chromosome. Down syndrome occurs due to the presence of an extra copy of chromosome 21, which is a result of nondisjunction during meiosis. Fetal alcohol syndrome is caused by exposure to alcohol during fetal development, spina bifida can be caused by environmental factors (maternal infection with rubella) or genetic factors, and twinning is not related to nondisjunction.

Which of the Following Is an Example of Nondisjunction