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The Cell Cycle

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  1. The Cell Cycle

  2. THE CELL CYCLE

  3. The Cell Cycle • Cell Reproduction • One cell (parent cell) reproduces to make 2 identical cells (daughter cells)

  4. There are three main divisions of the cell cycle • INTERPHASE • G1, S, G2 • MITOSIS • PMAT • Cytokinesis

  5. INTERPHASECells spend most of their time in this phase

  6. Do Drawings now

  7. Interphase Overall • Cell grows in size and metabolizes • Chromosomes duplicated

  8. Interphase has three divisions 1st phase= G1 Cell grows in size and lives its life

  9. “S” of Interphase (synthesis phase) DNA duplicates itself (DNA Replication)Chromatin duplicates – long coily strands of DNA that become wrapped up

  10. G2 = Rapid Growth before dividing • Organelles are doubled to have enough for two cells

  11. Interphase

  12. MITOSIS- Nuclear division(how we make 2 nuclei from 1)

  13. Mitosis • Prophase • A.) Chromatin organizes itself into condensed chromosomes made up of 2 sister chromatids attached by a centromere • Sister Chromatids – A chromosome and its duplicated twin • Centromere – rubber band structure that joins the 2 sister chromatids together

  14. Prophase • B.) Nuclear membrane breaks down • Nucleus dissolves • C.) Centrioles move to opposite ends of the cell (poles) • Centrioles – cylinder structures that will reel in the chromatids • D.) Spindle fibers form • Spindle fibers – football shaped set of ropes that will attach to the centrioles and the chromatids • Made of microtubules

  15. Prophase

  16. Mitosis • Metaphase • Spindle fibers attach to centrioles and sister chromatids at their centromeres. • Chromosomes line up in the middle of the cell • Line up on the metaphase plate/equator.

  17. Metaphase

  18. Metaphase

  19. Mitosis • Anaphase • The centromeres split apart and the sister chromatids separate from each other • The spindle fibers pull the chromatids toward the poles

  20. Anaphase

  21. Anaphase

  22. Mitosis • Telophase • Chromatids reach the poles • Chromosomes unwind • Spindle fibers break down • Nucleus reforms • Cell begins to split • Cleavage furrow

  23. Telophase

  24. Telophase

  25. After Mitosis… • Cytokinesis • Cells Separate

  26. Onion Cell Root Tip Lab

  27. Interphase

  28. Interphase

  29. Prophase

  30. Prophase

  31. Prophase

  32. Metaphase

  33. Metaphase

  34. Metaphase

  35. Metaphase

  36. Metaphase

  37. Anaphase

  38. Anaphase

  39. Anaphase

  40. Anaphase

  41. Anaphase

  42. Telophase and Cytokinesis

  43. Telophase and Cytokinesis

  44. Telophase and Cytokinesis

  45. Telophase and Cytokinesis

  46. Telophase and Cytokinesis

  47. Telophase and Cytokinesis

  48. Telophase and Cytokinesis

  49. Telophase and Cytokinesis

  50. Telophase and Cytokinesis