Cell reproduction (part 1)


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Cell reproduction (part 1)

  1. 1. Mr. Nettles Biology I: Cell Growth and Reproduction (Part 1)
  2. 2. Today’s Objectives <ul><li>I will define: growth , reproduction , asexual reproduction , and sexual reproduction . </li></ul><ul><li>I will explore an example of asexual reproduction. </li></ul><ul><li>I will explore an example of sexual reproduction </li></ul>
  3. 3. Agenda – Wed., Sept. 21, 2011 <ul><li>Warm-Up </li></ul><ul><li>Lesson </li></ul><ul><li>Wrap-Up </li></ul><ul><li>Research (The Cell Cycle) </li></ul>
  4. 4. Warm-Up (Review) <ul><li>Which group of biomolecules is responsible for making and storing energy ? </li></ul><ul><li>A normal cell swells when placed in a mystery solution . Is that mystery solution hypotonic or hypertonic? </li></ul><ul><li>I am an organelle only present in animal cell. I transfer chromosomes during cellular reproduction. What am I? </li></ul>
  5. 5. <ul><li>Reproduction – making new cells or organisms from older cells or organisms </li></ul><ul><li>Growth – how an organism </li></ul><ul><li>increases in size </li></ul><ul><li>and complexity </li></ul>copyright cmassengale
  6. 6. How do Prokaryotes grow and reproduce?
  7. 7. Prokaryotes Review: <ul><li>Lack a nucleus </li></ul><ul><li>Have a single chromosome </li></ul><ul><li>Reproduce by binary fission </li></ul><ul><li>Includes bacteria </li></ul>copyright cmassengale
  8. 8. Asexual Reproduction <ul><li>Reproduction that involves only one parent cell or organism. </li></ul><ul><li>Binary Fission is an example of asexual reproduction. </li></ul>copyright cmassengale
  9. 9. Asexual Reproduction Short Film
  10. 10. Steps in Binary Fission <ul><li>Used by bacteria (prokaryotes) </li></ul><ul><li>Cells increase in size a little </li></ul><ul><li>DNA & cell parts are copied </li></ul><ul><li>Each cell divides into 2 daughter cells </li></ul>copyright cmassengale
  11. 11. Binary Fission of Bacterial Cell copyright cmassengale
  12. 12. How do We (Eukaryotes) grow and reproduce?
  13. 13. Review Eukaryotes: <ul><li>Contain a nucleus & membrane bound organelles </li></ul><ul><li>Reproduce cells by mitosis </li></ul><ul><li>Includes plants, animals, and people </li></ul>copyright cmassengale
  14. 14. Sexual Reproduction <ul><li>Reproduction that involves two parent cells or organisms. </li></ul><ul><li>Mitosis is an example of sexual reproduction. </li></ul>copyright cmassengale
  15. 15. Sexual Reproduction Short Film
  16. 16. How many cells do we begin with?
  17. 17. 2
  18. 18. How do we get more?
  19. 19. Mitosis <ul><li>Mitosis: 1 cell splits into 2 identical cells </li></ul><ul><li>Then 4, then 8, then 16… </li></ul>
  20. 20. Mitosis <ul><li>Mitosis is like dividing in half. </li></ul><ul><li>Mitosis has 1 cell division. </li></ul>
  21. 21. Mitosis <ul><li>The cells produced by mitosis are identical to the parent cells. </li></ul>
  22. 22. Mitosis <ul><li>Body cells divide by mitosis for growth and repair. </li></ul>
  23. 23. Wrap-Up <ul><li>What is the difference between asexual and sexual reproduction? </li></ul><ul><li>Binary Fission is an example of _________ reproduction. </li></ul><ul><li>Define Growth. </li></ul>
  24. 24. Research: The Cell Cycle <ul><li>Choose one of the following stages of the cell cycle: G1 phase, S phase, G2 phase, M phase, or Cytokinesis. </li></ul><ul><li>Use the internet to research information about the stage that you have chosen. </li></ul><ul><li>Write four interesting things about what you read: </li></ul><ul><ul><ul><li>What is it? (The definition) </li></ul></ul></ul><ul><ul><ul><li>What happens? </li></ul></ul></ul><ul><ul><ul><li>How long does it happen? </li></ul></ul></ul><ul><ul><ul><li>What’s used? (What special cell parts or organelles are involved) </li></ul></ul></ul>