Question

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

-Cytokinesis of meiosis I
-Telophase of meiosis I
-Telophase of meiosis II
-Anaphase of meiosis II
-Anaphase of meiosis I

Answer 1

Nondisjunction typically occurs during Anaphase I of meiosis I and Anaphase II of meiosis II, when chromosomes fail to separate properly, leading to cells with an abnormal number of chromosomes.

Step-by-step explanation:

Nondisjunction typically occurs when chromosomes fail to separate properly during cell division. This can happen during two specific phases of meiosis: Anaphase I and Anaphase II.

During Anaphase I of meiosis I, spindle fibers shorten, and homologous chromosomes are meant to separate and move to opposite poles of the cell. Nondisjunction at this stage results in one daughter cell receiving both homologous chromosomes and the other receiving none.

Similarly, during Anaphase II of meiosis II, sister chromatids are supposed to separate and move to opposite poles. If nondisjunction occurs here, one gamete receives two copies of the chromosome, and another gamete receives no copies.

Nondisjunction does not typically occur during the Telophase of meiosis I or II, nor during the Cytokinesis of meiosis I.