Multiple Choice
During which phase of meiosis II are sister chromatids aligned along the metaphase plate in the center of the cell?
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12. Meiosis
Meiosis II
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During Meiosis II, which of the following separates?
A
Tetrads
B
Sister chromatids
C
Homologous chromosomes
D
Centrosomes
Verified step by step guidance1
Understand the context of Meiosis II: Meiosis is a type of cell division that reduces the chromosome number by half, producing four haploid cells. Meiosis II is the second division phase, similar to mitosis, where the goal is to separate sister chromatids.
Recall the key difference between Meiosis I and Meiosis II: In Meiosis I, homologous chromosomes (pairs of chromosomes, one from each parent) are separated. In Meiosis II, the sister chromatids (identical copies of a chromosome) are separated.
Analyze the options: Tetrads are groups of four chromatids formed during Meiosis I when homologous chromosomes pair up. Homologous chromosomes separate during Anaphase I of Meiosis I, not Meiosis II. Centrosomes are structures that organize microtubules and are not separated during Meiosis II.
Focus on the correct answer: During Meiosis II, sister chromatids are pulled apart and move to opposite poles of the cell. This occurs during Anaphase II, facilitated by the spindle fibers.
Conclude: The correct answer is 'Sister chromatids,' as they are the structures that separate during Meiosis II, ensuring each daughter cell receives a single copy of each chromosome.
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