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Answer: 3. Metaphase

Key idea: chromosomes line up at the equator in metaphase, with spindle fibres attached to their kinetochores.

In metaphase each chromosome has two kinetochores on its centromere, one for each sister chromatid, and microtubules from opposite poles attach to them. This holds the chromosomes on the metaphase plate. In anaphase the centromeres split and chromatids move apart; in telophase the nuclei re-form. In prophase the spindle is only starting to form.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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