First mitosis phase {prophase, mitosis} doubles chromosomes. Chromosomes condense, and human chromosomes have 350 to 550 bands. RNA-containing spindle-pole body centrosomes separate to cell sides. Microtubules form between centrosomes. Chromosome kinetochores attach to microtubules.
Second mitosis phase {metaphase} pairs chromosomes. Chromosomes align halfway between centrosomes.
Third mitosis phase {anaphase} separates chromosomes on spindles. Chromosomes move toward spindle poles.
Last mitosis phase {telophase} splits cell nucleus. Poles move apart.
Between mitoses, long phase {interphase} includes gap-1, S, and gap-2 stages.
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Date Modified: 2022.0225