AS Biology Unit 2 - The Cell Cycle

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Interphase

  • During Interphase:
    • Newly formed cell grow
    • Cell undertakes its normal function
    • Cell prepares to divide by:
      • Replicating it's chromosomes,
      • Chromosomes start to condense,
      • Some organelles increase in number.
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Prophase

  • Main features:
    • Chromosomes continue to condense and become visible
    • Nuclear envelope breaksdown
    • Nucleolus disappears
    • Spindle Forms
    • Centrioles move to opposite poles of cell.
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Metaphase

  • Main Features:
    • Chromosomes, as paired chromatids, line up at cell equator
    • Chromosomes attatch to spindle fibre
    • Fibres attatch at the centremere
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Anaphase

  • Main Features:
    • Spindle Fibres contract
    • Fibres pull chromatids apart with the centromere leading
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Telophase

  • Main Features:
    • Chromosomes decondense and become invisible
    • Nuclear Envelope reforms
    • Nucleolus reappears.
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Cytokinesis

  • During Cytokinesis:
    • Organelles become equally arranged at opposite sides of the cell
    • The cytoplasm divides
    • The cell divides to form two daughter cells
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