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Cell Division

Cell Division. Who has larger cells?. Which has larger cells a mouse or an elephant?. CELLS ARE SMALL!. Why do we need to make more cells?. From One Cell to Many. Sea Urchin Cell Division. Why do we need to make more cells?. Why do we need to make more cells?.

joan-nelson
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Cell Division

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  1. Cell Division

  2. Who has larger cells?

  3. Which has larger cells a mouse or an elephant?

  4. CELLS ARE SMALL!

  5. Why do we need to make more cells?

  6. From One Cell to Many Sea Urchin Cell Division

  7. Why do we need to make more cells?

  8. Why do we need to make more cells?

  9. Why are we one hundred trillion SMALL cells and not one hundred LARGE cells? 100,000,000,000,000 cells because....

  10. They need to be small!

  11. 1cm3= small Cell 3cm3= big Cell Sodium Hydroxide will React with phenolphthalein Inside agar cube

  12. DRAW WHAT YOU THINK WILL HAPPEN

  13. Result It takes much longer for molecules to get where they need to go if a cell is too big!

  14. Surface area: effects the rate of food, O2, H2O, and wastes moving in & out of the cell • Volume: effects the rate at which food, O2, H2O are used and waste is produced

  15. Mitosis Parent Cell Daughter Cells

  16. Cell Cycle

  17. Common Locations for Cell Division • Skin • Sperm cells • Blood cells- 120 days • Liver- sometimes

  18. Cells that Never Divide(In G0 phase) • Cardiac cells • Kidney • Nerve cells

  19. Checkpoints • G1 Checkpoint: • Cell size • DNA can be replicated • G2 Checkpoint • Cell size • DNA intact • DNA duplicated • M checkpoint • - Chromosomes are properly attached to the spindle fibers.

  20. What happens if the cell cannot pass through the checkpoint? • Repair the damage • OR • 2. Self-destructAPOPTOSIS (Programmed Cell Death)

  21. Mitosis Parent Cell Daughter Cells

  22. MITOSIS Daughter Cells Parent Cell

  23. Interphase • Prophase • Metaphase • Anaphase • Telophase

  24. Chromosome= Sister Chromatids

  25. 23

  26. MITOSIS Video Daughter Cells Parent Cell

  27. Mitosis( cell cycle) Videos for Flipbook • http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__mitosis_and_cytokinesis.htmlhttp://www.youtube.com/watch?v=VlN7K1-9QB0

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

http://www.youtube.com/watch?v=lf9rcqifx34å • http://www.youtube.com/watch?v=lf9rcqifx34 ( cell cycle)

  28. Animal Cell vs. Plant Cell Cytokinesis

  29. Onion Root Tip Lab

  30. ONION ROOT TIP

  31. Twilight DOES IT TOO!

  32. INTERPHASE

  33. PROPHASE

  34. METAPHASE

  35. ANAPHASE

  36. TELOPHASE

  37. I. Interphase:“I-ball”NOT A PHASE OF MITOSIS 90% of the time! 1. Gap 1 cell grows, doubles organelles 2. Synthesis Duplication of the DNA 3. Gap 2 cell grows

  38. Steps of Mitosis: (PMAT) Prophase Metaphase Anaphase Telophase http://www.goldiesroom.org/Note%20Packets/14%20Mitosis%20and%20Asexual/00%20Mitosis--WHOLE.htm

  39. 1. Prophase- • Chromatin fibers condense into chromosomes • Nuclear membrane breaks down • Spindle of microtubules forms from centrioles [animals only]

  40. 2. Metaphase- “middle” • Spindle fibers from centrioles attach to centromeres • Spindles move Chromosomes to line up in the middle Centriole Spindle

  41. 3. Anaphase: “away phase”, form “A’s” • Spindle fibers contract • Pull sister chromatids apart • Chromosomes move towards opposite ends • Each side has own copy of DNA Individual chromosomes

  42. 4. Telophase- “end phase” • Nuclear membranes reform at each pole • Chromosomes unwind • Spindle disappears

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