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Cell Division (Mitosis (4 Phases (Metaphase (Chromosomes line up at…

- - - - Chromosomes line up at metaphase plate
    - - Centromeres divide, sister chromatids migrate to opposite poles, cytokinesis begins
    - - Nuclear membrane disappears, centrosomes migrate, spindle fibers appear
    - - Nuclear membranes form, spindle disappears, cytokinesis occurs
        
        Cytokinesis: Division of cytoplasm
- - - - Fertilization restores diploid number
  - - - Metaphase I
        
        Homologues line up in pairs of female/male. Independent assortment of chromosomes occurs
        
        Independent assortment is the many ways chromosomes can line up. The assortment can change the genetic information
      - Anaphase I
        
        Homologous chromosomes, consisting of 2 chromatids, migrate to different sides. Same as mitotic anaphase
      - Prophase I
        
        Synapsis occurs. Homologue crossing over occurs
        
        Crossing Over
        
        When chromosomes are paired together, there are points that make contact with the other pair. The exchange of genetic information occurs. Increases genetic variation
      - Telophase I
        
        Cytokinesis occurs, and 2 haploid daughter cells are born
    - - Metaphase II
        
        Chromosomes line up
      - Anaphase II
        
        Centromeres divide and daughter chromosomes migrate
      - Prophase II
        
        Cells have one member of each homologous pair
      - Telophase II
        
        Nuclei forms, cytokinesis
  - - - Abnormal chromosome numbers in cells
- - - - Prevents cancer
      - Occurs during development to remove unwanted tissue