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Mitosis and the Cell Cycle Pgs. 61-68

Mitosis and the Cell Cycle Pgs. 61-68. Big Idea: Mitosis is the process in which the nucleus divides to form two new nuclei and two cells with identical DNA. . 1. How do little elephants grow up to be BIG elephants?. Why do animals shed their skin?. Mitosis begins after fertilization.

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Mitosis and the Cell Cycle Pgs. 61-68

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  1. Mitosis and the Cell Cycle Pgs. 61-68 Big Idea: Mitosis is the process in which the nucleus divides to form two new nuclei and two cells with identical DNA. 1

  2. How do little elephants grow up to be BIG elephants?

  3. Why do animals shed their skin?

  4. Mitosis begins after fertilization 1 cell becomes 2 cells, becomes 4 cells…becomes TRILLIONS

  5. Why do cells make more cells? Three reasons why cells reproduce by asexual reproduction: 1. Growth 2. Repair 3. Replacement

  6. Animated Mitosis Cycle http://www.cellsalive.com/mitosis.htm • Interphase • Prophase • Metaphase • Anaphase • Telophase & Cytokinesis

  7. Interphase occurs before mitosis begins • Chromosomes are copied (# doubles) • Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase CELL MEMBRANE Nucleus Cytoplasm

  8. Interphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  9. Prophase 1st step in Mitosis • Mitosis begins (cell begins to divide) • Centrioles(or poles) appear and begin to move to opposite end of the cell. • Spindle fibers form between the poles. Centrioles Sister chromatids Spindle fibers

  10. Prophase Plant Cell Animal Cell Spindle fibers Centrioles Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  11. Metaphase 2nd step in Mitosis • Chromatids (or pairs of chromosomes) attach to the spindle fibers. Centrioles Spindle fibers

  12. Metaphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  13. Anaphase 3rdstep in Mitosis • Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell. Centrioles Spindle fibers

  14. Anaphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  15. Telophase 4th step in Mitosis • Two new nuclei form. • Chromosomes appear as chromatin (threads rather than rods). • Mitosis ends. Nuclei Nuclei Chromatin

  16. Telophase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  17. Cytokinesisoccurs after Mitosis • Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.

  18. Animal Mitosis -- Review

  19. Plant Mitosis -- Review

  20. IPMATC REMEMBER! • Interphase • Prophase • Metaphase • Anaphase • Telophase • Cytokinesis IPreferMeatloafAtTennisCamp

  21. Cell Cycle

  22. - Cell Division The Cell Cycle 22

  23. MitosisAnimation http://www.cellsalive.com/mitosis.htm

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