Mitosis Tutorial
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Mitosis Tutorial Presentation Transcript

  • 1. Mitosis Tutorial By Jon Brander ED 205 Section 2 Quit
  • 2. Mitosis - What is Mitosis? - Stages of Mitosis - Interphase - Prophase - Prometaphase - Metaphase - Anaphase - Telophase - Cytokinesis - Why Mitosis? - Authors Page - Resources Quit
  • 3. What is Mitosis
    • Mitosis is the division of the nucleus and is often followed by cytokinesis, the division of the cytoplasm. This creates two genetically identical cells.
    • Mitosis occurs in a series of different stages.
    • Mitosis occurs exclusively in eukaryotes, but occurs in different ways in other species.
    • Mitosis and Cytokinesis are the shortest phases of the cell cycle. The longest phase being Interphase.
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  • 4. Interphase
    • Interphase is not technically part of mitosis, but is often included.
    • During interphase the cell grows and copies its chromosomes in preparation for cell division.
    • Chromosomes are not clearly discerned, although a dark spot called the nucleolus may be seen.
    • Also the cells may contain a pair of centrosomes, which are responsible for microtubule organization during mitosis.
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  • 5. Prophase
    • Chromatin Fibers become tightly coiled and chromosomes become evident.
    • The nucleolus disappears and the mitotic spindle begins to form.
    • The mitotic spindle is composed of the centrosomes (centrioles) and the mitotic spindles that extend from them.
    • Also the centrosomes begin to move away from one another
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  • 6. Prometaphase
    • The Nuclear envelope dissapears and the mitotic spindles begin to interact with the chromosomes.
    • Each of the two chromatids of the chromosome has a kinetochore attached to its centromere.
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  • 7. Metaphase
    • Metaphase is the longest stage of mitosis.
    • The centromeres are now at opposite ends of the cell.
    • The chromosomes meet in the middle of the cell along the metaphase plate.
    • Each sister chomatid is attached to a kinetochore from the opposite pole.
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  • 8. Anaphase
    • Anaphase is the shortest phase of Mitosis.
    • The two sister chromatids split to form chromosomes.
    • The two chromosomes move to opposite ends of the cell as the kinetochores shorten
    • The cell elongates
    • At the end of anaphase each side of the cell has equal amounts of chromosomes.
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  • 9. Telophase
    • Two daughter nuclei begin to form in the cell and nuclear envelopes begin to form.
    • Chromosomes become less condensed.
    • Mitosis: The division of one nucleus into two genetically identical nuclei, is now complete.
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  • 10. Cytokinesis
    • The division of the cytoplasm usually begins during late telophase, so two daughter cells appear shortly after mitosis.
    • In animals cytokinesis involves a cleavage furrow, which pinches the cell in two.
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  • 11. Why Mitosis?
    • Mitosis allows for the reproduction of multiple identical cells.
    • This allows for new skin cells to be produced when old ones fall off or wounds to be repaired.
    • Mitosis also plays a role in ones growth and development.
    • VIDEOS
    • - http:// www.youtube.com/watch?v =VlN7K1-9QB0
    • - http://www.youtube.com/watch?v=s1ylUTbXyWU
    • Interactive Animation
    • - http:// www.cellsalive.com/mitosis.htm
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  • 12. The Author
    • Hello, My name is Jon. I am a student at Grand Valley State University. I am studying for a secondary education degree with a major in biology and a minor in chemistry. I love to be outside and enjoy participating in many different sports, including wakeboarding.
    • EMAIL ME
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  • 13. Resources
    • -Biology 7 th Edition. 2005. Campbell and Reece
    • - Google Images
    • http://images.google.com/imghp?hl=en&tab=wi
    • Interactive Animation
    • http://www.cellsalive.com/mitosis.htm
    • Videos
    • http:// www.youtube.com/watch?v =VlN7K1-9QB0
    • http:// www.youtube.com/watch?v =s1ylUTbXyWU
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