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  • Cell division - Meiosis
    • Gametes
      • During sexual reproduction, two cells called gametes combine to form a new individual
      • They only have one copy of each chromosome. Human body cells have 46 chromosomes and gametes have 23 each
    • Involves 2 divisions
      • Before the cell starts to divide, it duplicates its DNA-one arm of each chromosome is and exact copy of the other arm
      • In the first division in meiosis the chromosome pairs line up in the centre of the cell
      • The pairs are then pulled apart, so each new cell only has one copy of each chromosome
      • In the second division the chromosomes line up again in the centre of a cell, the arms of the chromosomes are pulled apart
      • You get four gametes each with only a single set of chromosomes in it


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