Sci 9 Lesson 3 Feb 28 - Ch 5.1 Cytokinesis Checkpoints Cancer


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BC Science 9
Ch. 5.1 Cytokinesis Checkpoints Cancer
pp. 158-161

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Sci 9 Lesson 3 Feb 28 - Ch 5.1 Cytokinesis Checkpoints Cancer

  1. 1. Homework from last class: <ul><li>Complete the Mitosis, Stages of the Cell Cycle, and The Cell Cycle worksheets from the handout </li></ul><ul><li>Study for Quiz on Ch. 5.1 – The Cell Cycle and Mitosis (pp. 150-157) </li></ul><ul><li>Inform me of your Mitotic Movies group </li></ul><ul><li>Bring field trip forms and $ </li></ul><ul><li>Read over class notes and check out the class blog: </li></ul>
  2. 2. Ch. 5.1 Quiz You have ~7 minutes to write the quiz. Good luck!
  3. 3. Cytokinesis, Checkpoints in the Cell Cycle, and Cancer Chapter 5.1 pp. 158-161
  4. 4. Cytokinesis <ul><li>cytokinesis: the final stage of the cell cycle; separates the 2 nuclei and cell contents into 2 daughter cells. </li></ul><ul><li>New cells are identical to the parent cell. </li></ul>Parent cell (in telophase) 2 identical daughter cells
  5. 5. <ul><li>Animal cells – cell membrane pinches together to divide the cell’s cytoplasm and organelles </li></ul><ul><li>Plant cells – a cell plate forms along the centre of the cell to divide the cell into 2 daughter cells </li></ul>
  6. 6. Checkpoints in the Cell Cycle <ul><li>Activities in the cell cycle are monitored and controlled at specific stages (checkpoints). </li></ul><ul><li>Proteins at these checkpoints monitor cell activities </li></ul><ul><li>send info to nucleus </li></ul><ul><li>instructs the cell whether or not to divide </li></ul><ul><li>Cells will not divide if: </li></ul><ul><li>Not enough nutrients to support cell growth </li></ul><ul><li>DNA in nucleus has not been replicated </li></ul><ul><li>DNA is damaged </li></ul>
  7. 7. Checkpoints in the Cell Cycle p. 159
  8. 8. Control of the Cell Cycle <ul><li> </li></ul>
  9. 9. Activity time! Group 1: Onion Root Lab Activity Group 2: Cancer Investigation
  10. 10. Activity Instructions: <ul><li>I will divide you into 2 groups. </li></ul><ul><li>Group 1 will begin with the Onion Root Lab activity at the back of the class. </li></ul><ul><li>Group 2 will begin with the Cancer Investigation at the front of the class. </li></ul><ul><li>After 20 minutes, the groups will switch activities. </li></ul><ul><li>Complete your worksheets at each station. </li></ul>
  11. 11. Cancer <ul><li>Checkpoints in the cell cycle can stop the cell from growing and dividing . </li></ul><ul><li>Mutagens (ex. viruses, X rays, UV light, chemicals) can cause mutations in a cell and harm the organism. </li></ul><ul><li>If a mutation occurs in a gene producing the instructions for a checkpoint protein , cell cycle control will be lost  can lead to uncontrolled division (cancer) </li></ul>
  12. 12. <ul><li>Healthy cells stop dividing when they receive messages from neighbouring cells; cancer cells do not respond to messages from nearby cells  continue to divide  tumour </li></ul>p. 161
  13. 13. <ul><li>Cancer cells are not specialized , but release chemicals to attract small nearby blood vessels  branch into the tumour to deliver nutrients  feed tumour  tumour growth </li></ul><ul><li>Cancer can spread to other parts of the body if some tumour cells break away  carried by the blood vessels to a new location  can form another tumour </li></ul><ul><li>Cancer cells have large, abnormal nuclei because cell division checkpoints no longer function  chromosomes do not divide correctly </li></ul>
  14. 15. Cancer Animations <ul><li> </li></ul>
  15. 16. Homework for next class: <ul><li>Complete the Onion Root Lab Activity and The Cell Cycle and Cancer worksheet </li></ul><ul><li>Read notes on Cancer on the class blog (in this slideshow) </li></ul><ul><li>Keep working on your Mitotic Movies project </li></ul><ul><li>Bring field trip forms and $ ASAP </li></ul><ul><li>Read over class notes and check out the class blog: </li></ul>
  16. 17. Works Cited <ul><li>Images taken from the following sources: </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul>