Biology help (mitosis)

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chromosomes condense (become visible)

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nucleolus disappears

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nuclear envelope disappears

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2 centrioles at the poles, to form spindle fibres

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chromosomes line up on the equator (imaginary line at centre)

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spindle fibres attach to the chromosomes on their centromere (kinetochore)

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kinetochore (protein at centromere)

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centromere splits

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each of the sister chromatids moves to opposite poles, pulled along spindle fibres

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(polar spindle fibres = attach from 1 pole to another)

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(spindle fibres = attach from 1 pole to a centromere on chromatid)

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chromatids at the poles

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nucleolus reforms

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nuclear envelope reforms

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no spindle fibres