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Understanding Cell Division: Processes and Importance in Life

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Cell division is a vital process that ensures the growth, development, and repair of multicellular organisms and facilitates reproduction in unicellular organisms through binary fission. This video explains how cells divide, highlighting key stages such as interphase, prophase, metaphase, anaphase, and telophase, along with apoptosis as a regulatory mechanism for maintaining cell number. Learn about chromosomes, sister chromatids, and the end product of cell division: two identical daughter cells, essential for life and homeostasis in all living organisms.

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Understanding Cell Division: Processes and Importance in Life

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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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