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Understanding the Cell Cycle: The Puzzle of Growth and Repair

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Explore the phases of the cell cycle - Interphase, Mitosis, Cytokinesis. Learn how cells replicate and divide to create identical body cells for growth and repair. Discover the impact of abnormal changes in cell cycle leading to cancer.

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Understanding the Cell Cycle: The Puzzle of Growth and Repair

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  1. Pieces of the puzzle… Cell Cycle

  2. The Goal • To make an identical body cell. • For growth or repair! http://www.msnbc.msn.com/id/12136506/

  3. Interphase http://www.lima.ohio-state.edu/biology/images/interphase.jpg http://botit.botany.wisc.edu/images/130/Mitosis/Allium_Root_Prep._Slides/interphase.low.jpg Cells go through a life cycle known as the cell cycle. The phases of the cell cycle are interphase, mitosis, and cytokinesis. Mitosis Cytokinesis http://www.biologyreference.com/images/biol_01_img0100.jpg

  4. 1. Interphase What’s Happening in the cell: • G1: initial growth • S: DNA Replication • G2: organelles are made I-PMAT “Inter” – between – you drive on the interstate to go between MD and VA

  5. Interphase- Increase

  6. 2. Prophase What’s Happening in the cell: • Centrioles appear • Nucleus Splits • Chromosomes Pair I-PMAT

  7. Prophase - pair

  8. 3. Metaphase What’s Happening in the cell: • Centrioles move to opposite ends • Chromosomes line up • in the middle • c. Spindle fibers begin to form I-PMAT

  9. Metaphase - Middle

  10. 4. Anaphase What’s Happening in the cell: • Chromosomes pull apart and move to opposite ends of the cell I-PMAT

  11. Anaphase - apart

  12. 5. Telophase What’s Happening in the cell: • Telo = End • Two new nuclei form • Chromosomes • unravel I-PMAT

  13. Telophase – twins!

  14. 6. Cytokinesis What’s Happening in the cell: • Cell membrane moves inward to create two daughter cells • each daughter cell has its own nucleus with identical chromosomes Cyto = Cell Kinetic = movement

  15. Cytokinesis – Cut

  16. Interesting Factoids • Asexual reproduction gone awry is CANCER • Heredity, certain chemicals, and radiation can cause abnormal changes to a cell. The result can be growth and spread of abnormal cells throughout an organism.

  17. Interesting Factoids • Abnormal growths, or tumors can be benign or malignant. • Malignant cells may break free and migrate to new locations to form a new tumor. • Cancer is not disorganized cell growth. It is a process by which certain cells acquire abnormal size, shape, and abilities. • The spread of malignant cells to new locations is known as cancer.

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