Scelta multipla
During which phase of meiosis do homologous chromosomes separate and move to opposite ends of the cell?
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9. Mitosis and Meiosis
Meiosis
Scelta multipla
In meiosis I, homologous chromosomes separate, whereas in meiosis II, which of the following occurs?
A
Sister chromatids separate
B
DNA replication occurs
C
Homologous chromosomes pair up
D
Crossing over takes place
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Recall the key events of meiosis I: homologous chromosomes pair up and then separate into two daughter cells. This reduces the chromosome number by half.
Understand that meiosis II resembles a mitotic division where the sister chromatids of each chromosome are separated.
Identify that DNA replication occurs only once before meiosis I, not before meiosis II, so it does not happen during meiosis II.
Recognize that crossing over occurs during prophase I of meiosis I, not during meiosis II.
Conclude that the main event of meiosis II is the separation of sister chromatids, resulting in four haploid cells.
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