Meiosis

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  • Meiosis
    • Before meiosis begins
      • each chromosome exists as 2 identical chromatids
        • attached to their centromere
    • First meiotic division
      • 1.chromosomes align in homologous pairs
        • Chiasmata = the crossing over point of the 2 identical chromosomes
      • 2. the homologous pairs lines up on the equator of cell
        • Equal lengths of chrmoatids from same homologous pairs cut off and cross over
      • 3. H.P. align randomly on equator of cell
      • 4. H.P. seperate
      • 5. cell divides to form 2 new cells
        • each with haploid set of chromosomes
      • 6. cell division complete
    • Second meiotic division
      • 1. Chromosomes in each cell align on equator randomly
      • 2. chromatids in each cell are separated
        • Chromatids pulled to opposite poles of cell.
      • 3. cells divide
        • cell division complete= gives 4 cells with haploid number
  • H.P. = Homologous Pairs

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