Cell division

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  • Created by: Sarah
  • Created on: 15-04-13 12:21
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  • Cell division
    • Mitosis
      • Makes new cells for growth and repair
      • A cell reproduces itself by splitting to form two identical offspring
      • Body cells
        • Have 23 pairs of chromosomes
        • Have two copies of each chromosome
      • The cell duplicates its DNA
        • This forms X shaped chromosomes- the left and right 'arms' are identical
          • The chromosomes line up at the centre and the arms are pulled apart by cell fibres
            • Mebranes form around the new sets of chromosomes - nuclei
              • The cytoplasm divides
    • Meiosis
      • Produces cells which have half the number of normal chromosomes
      • Gametes
        • Have 23 chromosomes
        • Can combine one from the mother and one from the father
          • Get a body cell
            • Body cells
              • Have 23 pairs of chromosomes
              • Have two copies of each chromosome
      • The cell duplicates its DNA
        • This forms X shaped chromosomes- the left and right 'arms' are identical
          • The chromosome pairs line up at the centre and are pulled apart
            • Each new cell only has one copy of each chromosome
              • The chromosomes line up at the centre and the arms are pulled apart by cell fibres
                • End up with 4 gametes

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