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Summary OCR A/AS-Level Biology 2.6.2 Stages of Mitosis
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Revision Summary of key knowledge from OCR A/AS-Level Biology 2.6.2 Stages of Mitosis.
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Stages Of MitosisEarly Prophase
Chromosomes coil and condense (shorten and contract and thicken) into chromatids
Chromatids take up stain mor easily and become more distinct
Nucleolus is still present
Centrioles divide
Late Prophase
Nuclear membrane disintegrates
Nucleolus shrinks and disappears
Centrioles migrate to opposite poles
Metaphase
Spindle fibres attach to centrioles and centromeres of chromatids
Each centromere attaches to both poles by spindle fibres
Chromatids line up at the equator
Anaphase
Centromeres divide
Chromatids are pulled apart towards the poles
Telophase
Chromatids reach the poles and start to uncoil into chromosomes
Chromosomes become less distinct
Nuclear envelope starts to reform around each set of chromosomes
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