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Multiple Choice
Which of the following occurs during metaphase II of meiosis?
A
Homologous chromosomes pair up at the equatorial plate.
B
Crossing over occurs between homologous chromosomes.
C
Sister chromatids align at the equatorial plate.
D
The nuclear envelope re-forms around each set of chromosomes.
Verified step by step guidance
1
Understand that meiosis is a type of cell division that reduces the chromosome number by half, resulting in four haploid cells. It consists of two stages: meiosis I and meiosis II.
Recall that metaphase II is a stage in meiosis II, which follows meiosis I. During meiosis I, homologous chromosomes are separated, while meiosis II is similar to mitosis, where sister chromatids are separated.
In metaphase II, the chromosomes, each consisting of two sister chromatids, align at the equatorial plate of the cell. This is a key characteristic of metaphase II.
Differentiate between the events of metaphase I and metaphase II. In metaphase I, homologous chromosomes pair up at the equatorial plate, whereas in metaphase II, it is the sister chromatids that align at the equatorial plate.
Recognize that crossing over occurs during prophase I of meiosis, not during metaphase II. The nuclear envelope re-forms during telophase, not metaphase II. Therefore, the correct event during metaphase II is the alignment of sister chromatids at the equatorial plate.