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Cell Division - Mitosis (Stages of Mitosis (1 - Prophase (longest stage,…

- - - - many proteins e.g. histones and enzymes are synthesised
      - much ATP energy is needs - respiration is fast
      - DNA is copied - amount in cell doubles. happens while chromosomes are decondensed and the chromatin is dispersed through the nucleus - called s phase
  - - - Contractile proteins for a ring and shorten pinching in the plasm membrane forming a cleavage furrow (outside in) until 2 cells are formed
    - - Golgi vesicles containing cell wall material aggregate then meet at the equator of the cell - moved by spindle fibers
      - Forms a cell plate which develops from centre outwards until it extends across the cell forming two cells - membranes of the vesicles form plasma membranes of the new cell
- - - - Only occurs in specialised regions called meristems - e.g. just behind apex of root
      - Number of cells increase but they remain small
      - Majority of plant growth occurs through elongation of the cells produced by mitosis
    - - Occurs in most animal tissue
      - occurs during growth and to replace damaged, warn out and dead cells in mature tiddues
      - e.g. gut lining and skin is warn away + bone marrow constantly produces red and white blood cells