Question

When does nondisjunction typically occur (choose all that apply)?

Multiple select question.
Telophase of meiosis II
Anaphase of meiosis II
Cytokinesis of meiosis I
Anaphase of meiosis I
Telophase of meiosis I

Answer 1

Nondisjunction typically occurs during anaphase stages of meiosis, causing gametes to have an incorrect number of chromosomes, and does not typically happen during telophase or cytokinesis.

Step-by-step explanation:

Nondisjunction can typically occur during the anaphase stages of meiosis, which are critical points for the segregation of chromosomes. Specifically, nondisjunction can take place during Anaphase of meiosis I or Anaphase of meiosis II. In Anaphase I, the homologous chromosomes should separate, while in Anaphase II, sister chromatids are the ones to separate. Failure in these separations can lead to gametes with an incorrect number of chromosomes and is referred to as nondisjunction. Telophase, on the other hand, is the phase where the chromosomes reach their respective poles and a nuclear membrane starts to form around each set of chromosomes, preparing the cell for cytokinesis. Typically, nondisjunction does not occur during telophase or cytokinesis.