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  • Created by: wilby99
  • Created on: 06-01-16 13:05
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  • Mitosis
    • 1) Prophase
      • The chromosomes start to condense and become visable in the nucleus
      • Spindle fibres form when the centrioles (in animal cells) have moved to opposite ends of the cell.
      • nuclear envelope disappears
    • 2) Metaphase
      • Chromosomes line up along the equator of the spindle.
      • Spindle attaches to the centromere
    • 3) anaphase
      • Chromosomes divide at the centromere.
      • Spindle fibres shorten and pull the chromatids back to the centriole.
    • 4) telophase
      • When the chromatids have reached the poles they can be seen as chromosomes: They  uncoil to form chromatin.
      • A nuclear envelope appears around the new group of chromosomes and a new nucleolus forms
    • 5) Cytokineses
      • Animal cells:  the cytoplasm 'pinches' in and forms a division furrow on the same plane as the equator. The membranes on each side the join up to form two new cells.
        • The furrow forms because of the contraction of a ring made up of two proteins called Actin and myosin.
      • Plant cells:     vesicles collect on the equator which then fuse together to form a cell plate which then stretches across the cell to make the middle lamella. Cellulose then forms along either side of this to form a new cell wall.
    • significance of mitosis
      • Growth: increase of cells to make new tissues
      • Repair of tissue: New cells are formed to replace the old damaged ones.
      • Asexual reproduction: only in uni-cellular organisms


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