A Single Nondisjunction Event During Meiosis

Question

A single nondisjunction event during meiosis
A)will block recombination.
B)will occur only during meiosis II.
C)cannot occur with sex chromosomes.
D)will result in the production of two normal gametes if it occurs during meiosis II.

Accepted Answer

Nondisjunction during meiosis II can lead to the production of two normal gametes (each receiving the correct number of chromosomes) and two abnormal gametes (one with an extra chromosome and one missing a chromosome), because the error occurs after chromosomes have been properly segregated in meiosis I.