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How do little elephants grow up to be BIG elephants?

How do little elephants grow up to be BIG elephants?. Why do animals shed their skin?. Why Divide?. Growth Repair damaged cells Replace old cells. Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun.

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How do little elephants grow up to be BIG elephants?

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

  2. Why do animals shed their skin?

  3. Why Divide? Growth Repair damaged cells Replace old cells Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun. Cell that reproduce by asexual reproduction reproduce constantly.

  4. Stages of Cell Cycle http://www.cellsalive.com/mitosis.htm • Interphase • Mitosis • Prophase • Metaphase • Anaphase • Telophase • * Cytokinesis

  5. Interphaseoccurs before mitosis begins • Chromosomes are copied (# doubles) • At the start, Chromosomes appear as threadlike coils called chromatin at the start, • After copying is done, each chromatin end up with an exact duplicate and they are called sister chromatids. CELL MEMBRANE Nucleus Cytoplasm

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

  7. Prophase 1st step in Mitosis • Mitosis begins (cell begins to divide) • Chromosome condenses and now visible. • 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

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

  9. Metaphase 2nd step in Mitosis • Chromosome line up at the middle. • Chromosomeattach to the spindle fibers. Centrioles Spindle fibers

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

  11. Anaphase 3rdstep in Mitosis • Sister Chromatids separate and begin to move to opposite ends of the cell. Centrioles Spindle fibers

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

  13. Telophase4th step in Mitosis • Nuclear membrane forms around chromosome • Chromosome uncoils and no longer visible. • Cell begins to pinch in the middle. Nuclei Nuclei Chromatin

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

  15. Cytokinesisoccurs after mitosis • Organelles divide to each end • Cell membrane forms between the two sections of the cell and seperates. • Two daughter cells are formed– each with its own nucleus with identical chromosomes.

  16. Animal Mitosis -- Review

  17. Plant Mitosis -- Review

  18. Cell Cycle

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

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