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Review+Of+Mitosis

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  • 1. Review of Mitosis Prophase Metaphase Anaphase Telophase 1 2 3 4
  • 2. Overview of Mitosis: Prophase, Metaphase, Anaphase, Telophase
  • 3. Overview of Meiosis: Prophase I, Metaphase I, Anaphase I, Telophase I, Prophase II, Metaphase II, Anaphase II, Telophase II
  • 4. Prophase I
    • In prophase I:
      • The nuclear membrane breaks down
  • 5. Metaphase I
    • In Metaphase I:
        • This is different than Metaphase in Mitosis
        • Chromosomes line up in pairs
        • Kinetochore fibers attach to centromeres
  • 6. One thing that happens during metaphase I is that parts of the sister chromosomes can actually cross-over and switch. This allows for new combinations of genetic material. (This is why we don’t look just like our moms or dads) This is called genetic recombination.
  • 7. Anaphase I
    • In Anaphase I
      • Homologous chromosomes seperate
        • The chromatids do not seperate
  • 8. Telophase I
    • In Telophase I
      • Cells Split
      • New Nuclear Membrane forms
        • At this point, each cell has 46 chromosomes
        • 2n
  • 9. Prophase II
    • In Prophase II:
        • These cells go straight from telophase I to prophase II. They skip interphase.
        • NO CELL CYCLE
  • 10. Metaphase II
    • In Metaphase II:
      • Chromosomes line up along midline of cell
  • 11. Anaphase II
    • In Anaphase II:
      • CHROMATIDS separate
        • Just like Mitosis
  • 12. Telophase II
    • In Telophase II:
      • Nuclear Membrane begins to form
      • Each cell has 23 chromosomes
      • 1n
  • 13. Review of the difference between Mitosis and Meiosis
  • 14. Oogenesis
    • Occurs in the ovaries
    • Two divisions produce 3 polar bodies that die and 1 egg
    • Polar bodies die because of unequal division of cytoplasm
    • Immature egg called oocyte
    • Starting at puberty, one oocyte matures into an ovum (egg) every 28 days
  • 15. Spermatogenesis
    • Occurs in the testes
    • Two divisions produce 4 spermatids
    • Spermatids mature into sperm
    • Men produce about 250,000,000 sperm per day
  • 16. Questions
    • What kind of cells are we creating during meiosis?
    • How many chromosomes do they end up with?
    • How many chromosomes do cells end with in mitosis?

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