Meiosis - Mendelian Genetics - Genetics and Evolution

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  • Meiosis -Mendelian Genetics -  Genetics and Evolution
    • Meiosis
      • DNA is replicated only once
      • Two nuclear divisions
        • Meiosis 1 and Meiosis 2
      • Reduces number of chromosomes to n
    • Meiosis 1
      • Early prophase 1
        • DNA replicated and tangled
      • Mid prophase 1
        • Lining up to allow crossover
        • fully packaged chromosomes
        • genetic variation
      • Late prophase 1 - prometaphase
        • crossing over, envelope breaking down
      • Metaphase 1
        • lining up on equatorial plate
      • Anaphase 1
        • Independent assortment and random segregation
        • Separated to opposite sides
      • Telophase 1
        • Unpackaging of cell
        • Two daughter cells
    • Meiosis 2
      • Follows interkinesis
      • Prophase 2
        • Packed with proteins to make chromosomes
      • Metaphase 2
        • Line up on equatorial plate
      • Anaphase 2
        • Chromosomes pulled apart
        • Daughter chromosomes
      • Telophase 2
      • Products
        • 4 cells
        • n
        • Differ in genetic composition
        • Human 23 chromosome pairs
        • 8388608 different combinations by independent assortment
        • add in crossing over, almost infinite possible combinations

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