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Cell Division

Cell Division. http:// www.youtube.com / watch?v =VlN7K1-9QB0. Why must cells divide?. Allow for efficient transport Growth, development, and repair of multicellular organisms Reproduction of unicellular organisms. Binary Fission. http:// www.youtube.com / watch?v = gEwzDydciWc.

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Cell Division

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  1. Cell Division

  2. http://www.youtube.com/watch?v=VlN7K1-9QB0

  3. Why must cells divide? • Allow for efficient transport • Growth, development, and repair of multicellular organisms • Reproduction of unicellular organisms

  4. Binary Fission • http://www.youtube.com/watch?v=gEwzDydciWc

  5. What 2 processes maintain homeostasis in terms of cell number? • Division • Apoptosis (http://www.youtube.com/watch?v=6KVQzYO_2tY)

  6. Interphase

  7. Interphase • DNA in chromatin form • Nuclear envelope in tact • Inactive centriole • Carrying out normal function

  8. Prophase

  9. Prophase • Nuclear envelope breaks down • Chromatin condenses into chromosomes • Centrioles move to poles and begin making spindle fibers (aster)

  10. What is a chromosome?

  11. Why is each arm called a sister chromatid?

  12. Metaphase

  13. Metaphase • Chromosomes line up at “metaphase plate” • Spindle fibers attach to centromere of chromosome

  14. Anaphase

  15. Anaphase • Spindle fiber shorten and pull apart the sister chromatids • Sister chromatids move to opposite poles of cell becoming daughter chromosomes

  16. Telophase

  17. Telophase • Chromosomes decondense to chromatin • Nuclear envelope reforms • Spindle fibers break down • Cytokinesis begins

  18. Cytokinesis

  19. End Product • 2 daughter cells with identical chromosome number

  20. In which class of cells does this occur?

  21. Division in Prokaryotes • http://www.youtube.com/watch?v=gEwzDydciWc&feature=related

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