Cell Division by mitosis

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  • Created by: Maddie
  • Created on: 13-04-13 14:42


  • normal growth
  • DNA replicates
  • synthesis of proteins needed for mitosis
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Prophase & Metaphase


  • chromatin condenses (becomes visible), the chromosomes consist of 2 sister chromatids, joined by the centromere
  • nuclear envelope/membrane breaks down
  • centriole divides into 2, each moves to opposite poles of cell
  • microtubules start to assemble around centrioles, forming spindles


  • chromatid pairs attach to the spindle microtubules at the centromere
  • chromatid pairs line up along cell equator
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Anaphase & Telophase


  • centromeres divide
  • sister chromatids pulled apart by spindle fibres to opp. poles of cell


  • chromatids reach poles of spindle
  • chromatids are separated so are now chromosomes
  • chromosomes unravel and can no longer be seen under light microscope
  • nuclear membrane reforms
  • spindle breaks down and disappears
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  • nucleus has divided
  • now 2 nuclei in cell
  • cytoplasm splits --> 2 independent cells formed
  • each contains a full set of chromosomes
  • each genetically identical to each other & to parent cell
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