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Sci 9 Lesson 2 Feb 23 - Ch 5.1 Mitosis


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BC Science 9
pp. 155-156

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Sci 9 Lesson 2 Feb 23 - Ch 5.1 Mitosis

  1. 1. Homework from last class: <ul><li>Complete ‘Identifying stages of the cell cycle’ (p. 71 of the worksheet) </li></ul><ul><li>Answer Reading Check questions 1-6 (p. 155) </li></ul><ul><li>Complete student questionnaire </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. Identifying stages of the cell cycle Use the following vocabulary works in the box above to label the stages of the cell cycle in the following diagram: 1. 2. Growth and preparation Replication 3. Continued growth and preparation 4. Mitosis 5. Cytokinesis 6. Interphase continued growth and preparation cytokinesis replication growth and preparation interphase mitosis
  3. 3. Briefly describe what is occurring in each stage of the cell cycle: 1. 2. 3. 4. 5. 6. Growth and preparation: Cells grow and carry out life functions. Replication: The nucleus makes a copy of its DNA. Continued growth and preparation: There is continued growth and preparation for mitosis. Mitosis: The nucleus of the cell divides into 2 equal and identical parts. Cytokinesis: The 2 equal, identical parts of the cell separate. Interphase: Cells grow and carry out their life functions.
  4. 4. <ul><li> </li></ul>Ms. Soon’s Science Site: Science 9 Class Blog:
  5. 5. Mitosis Chapter 5.1: The Cell Cycle and Mitosis pp. 155-156
  6. 6. Mitosis
  7. 7. Note: <ul><li>Terms in green are definitions </li></ul><ul><li>– these are key terms to know </li></ul><ul><li>Terms in blue are important words or concepts </li></ul><ul><li> – please make note </li></ul>
  8. 8. Introduction to Mitosis <ul><li>BC Science 9 Site: Unit 2 - Reproduction </li></ul><ul><li> </li></ul>Mitosis animation
  9. 9. Mitosis <ul><li>What is mitosis? </li></ul><ul><li>mitosis : the second and shortest stage of the cell cycle; the process in which the duplicated contents of the cell’s nucleus divides into two equal parts </li></ul><ul><li>occurs in order for organisms to grow and develop </li></ul><ul><li>What is the end result of mitosis? </li></ul><ul><li>2 daughter nuclei , each with the same number </li></ul><ul><li>and kinds of chromosomes as the original cell . </li></ul>
  10. 10. sister chromatids: formed when DNA replicates during interphase and joined together by a centromere. centromere: the structure that joins two sister chromatids together. p. 156
  11. 11. Phases of Mitosis p. 156- 157 <ul><li>Early prophase </li></ul>2) Late prophase 3) Metaphase 4) Anaphase 5) Telophase
  12. 12. 1) Early prophase <ul><li>Replicated chromosomes coil up into an ‘X’ and become visible under a light microscope </li></ul><ul><li>Nucleolus disappears </li></ul><ul><li>Nuclear membrane begins to break down </li></ul><ul><li>Spindle fibers (tiny tube-like structures made of protein) begin to form in plant and animal cells </li></ul>
  13. 13. 2) Late prophase <ul><li>Spindle fibers complete forming. </li></ul><ul><li>Chromosomes attach to the spindle fibers at their centromeres. </li></ul><ul><li>Nuclear membrane disappears. </li></ul>spindle fibers centromere
  14. 14. 3) Metaphase <ul><li>Spindle fibers tug X-shaped chromosomes. </li></ul><ul><li>The duplicated chromosomes line up across the middle of the cell. </li></ul>Chromosomes at the equator
  15. 15. 4) Anaphase <ul><li>The duplicated chromosomes move apart to opposite ends of the cell . </li></ul>Pole
  16. 16. 5) Telophase <ul><li>A nuclear membrane forms around the chromosomes at the opposite ends of the dividing cell . </li></ul><ul><li>One complete set of chromosomes now at each pole of the cell. </li></ul><ul><li>Spindle fibers begin to disappear . </li></ul><ul><li>A nucleolus appears within each nucleus. </li></ul><ul><li>Cell is now ready to divide. </li></ul>Nucleolus Nuclear membrane
  17. 17. Review – Name that phase! Prophase (Good job!)
  18. 18. Review – Name that phase! Anaphase (Great!)
  19. 19. Review – Name that phase! Metaphase (Yes!)
  20. 20. Review – Name that phase! Telophase (Woo hoo!)
  21. 21. Summary <ul><li>Mitosis: </li></ul><ul><li>1 parent cell 2 daughter cells </li></ul><ul><li>Mitosis occurs regularly in tissues that require new cells. </li></ul><ul><li>Mitosis allows for an organism to grow and develop over its lifespan and replenishes dead or dying cells in certain tissues. </li></ul>
  22. 22. Project: Mitotic Movies!
  23. 23. “ Stages of the Cell Cycle” worksheet <ul><li>NOTE: </li></ul><ul><li>The blanks did not get copied into your worksheet. Please add the following shaded-in boxes: </li></ul>
  24. 24. Stages of the Cell Cycle (BLM 2-11 worksheet) Name of Cell Cycle Stage Cell Activities Nucleus Activities Interphase Growth and preparation Replication Continued growth and preparation Mitosis Early prophase Late prophase Metaphase Anaphase Telophase
  25. 25. Homework for next 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. 150-156) </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: http:// / </li></ul>
  26. 26. 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>