Multiple Choice
In an organism with $n=2$, which phase of meiosis is shown last in the diagram?
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12. Meiosis
Meiosis II
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During which phase of Meiosis II are sister chromatids separated and move toward opposite poles of the cell?
A
Telophase II
B
Anaphase II
C
Prophase II
D
Metaphase II
Verified step by step guidance1
Understand the process of Meiosis II: Meiosis II is the second division in meiosis, where the sister chromatids are separated to produce haploid cells. It consists of four phases: Prophase II, Metaphase II, Anaphase II, and Telophase II.
Review the role of sister chromatids: Sister chromatids are identical copies of a chromosome connected by a centromere. Their separation is a key event in Anaphase II.
Analyze the phases of Meiosis II: In Prophase II, chromosomes condense and spindle fibers begin to form. In Metaphase II, chromosomes align at the metaphase plate. In Anaphase II, sister chromatids are pulled apart by spindle fibers toward opposite poles. In Telophase II, the cell prepares to divide, forming nuclei around the separated chromatids.
Focus on Anaphase II: During Anaphase II, the centromeres split, and the spindle fibers pull the sister chromatids apart, moving them to opposite poles of the cell. This is the phase where chromatids are separated.
Confirm the correct answer: Based on the description of the phases, the correct answer to the question is Anaphase II, as this is the phase where sister chromatids are separated and move toward opposite poles of the cell.
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