Cell Division - Meiosis

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  • Created by: 09Butcher
  • Created on: 04-05-14 16:49
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  • Meiosis
    • Produces cells which have half the normal number of chromosomes
    • Involves 2 divisions
    • Produces gametes (sex cells) and only occurs in reproductive organs: ovaries and testes
    • 1. Duplicates DNA and the cell starts to divide
    • 2. First Division - the chromosome pairs line up in the centre of the cell
    • 3. Pairs are pulled apart, so each new cell has one copy of each chromosome
      • Includes both fathers and mothers
    • 4. Second Division - the chromosomes line up again in the centre, and are pulled apart
    • 5. You get 4 gametes each with only a single set of chromosomes in it
    • After 2 gametes join in fertilisation, cell grows by mitosis

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