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MEIOSIS (Products (haploid gametes (sex cells (ovum (combine to create a…

- - - - ovum
        
        combine to create a zygote cell (2n)
      - spermatozoa
    - - genetic variation
        
        'crossing over'
        
        prophase 1
        
        random/ independent assortment
        
        of chromosomes
        
        metaphase 1
        
        of chromatids (of chromosomes)
        
        metaphase 2
- - - - 'crossing over' occurs
        
        alleles shuffle
        
        chiasmata (point of crossing over) forms
      - chromatin condenses and chromosomes supercoil
      - nuclear envelope disappears
      - spindle fibres form
      - chromosomes come together in homologous pairs
    - - bivalents (pair of homologous chromosomes) line up on the metaphase plate
      - independent assortment of chromsomes
    - - chiasmata separate
      - homolougous chromosomes pulled apart
        
        half the number of chromosomes (per cell)
        
        reduction division
    - - nuclear envelope reforms
      - cytokinesis
      - centrioles divide
      - short interphase occurs
      - chromosomes recoil
  - - - nuclear envelope breaks down and nucleolus disappears
      - chromosomes coil and condense
      - centrioles replicate and move to opposite poles
      - new spindle fibres form at right angles to previous
    - - chromosomes move to metaphase plate/ equator
      - independent assortment of chromatids, (of the chromosomes)
    - - chromatids move to opposite poles
      - centromeres (where the chromosomes are attached to the spindle) divide
      - chromatids are segregated
    - - nuclear envelope forms around sets of chromosomes
      - 4 haploid nuclei
- - - - (pairs of homologous chromosomes separate into 2 cells)
    - - (pairs of chromatids which're present in each daughter cell are separated
- - - - 'crossing over'