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Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
Cell reproduction (part 2)
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Cell reproduction (part 2)

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  • 1. Mr. Nettles Biology I: Cell Growth and Reproduction (Part 2)
  • 2. Today’s Objectives <ul><li>I will define: chromosomes , sister chromatids , and centromere. </li></ul><ul><li>I will explore the stages of the cell cycle. </li></ul><ul><li>I will explore the phases of mitosis. </li></ul>
  • 3. Agenda – Thurs., Sept. 22, 2011 <ul><li>Warm-Up </li></ul><ul><li>Presentations (Homework from last night) </li></ul><ul><li>Lesson </li></ul><ul><li>Wrap-Up </li></ul>
  • 4. Warm-Up <ul><li>Mitosis is a form of ________________ reproduction. </li></ul><ul><li>Eukaryotes reproduce by _________________. </li></ul><ul><li>Prokaryotes reproduce by ________________. </li></ul>
  • 5. 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>
  • 6. The Cell Cycle <ul><li>A process by which cells: </li></ul><ul><ul><li>Grow </li></ul></ul><ul><ul><li>make copies of chromosomes </li></ul></ul><ul><ul><li>divide into new daughter cells </li></ul></ul>copyright cmassengale
  • 7. The Cell Cycle <ul><li>Has three parts: </li></ul><ul><ul><li>Interphase </li></ul></ul><ul><ul><li>Mitosis </li></ul></ul><ul><ul><li>Cytokinesis </li></ul></ul>copyright cmassengale
  • 8. Interphase <ul><li>G1 Phase = “gap 1” phase </li></ul><ul><ul><ul><ul><li>First growth stage </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Cell gets bigger </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Cell prepares to copy its DNA </li></ul></ul></ul></ul>
  • 9. Interphase
  • 10. The set of 46 human chromosomes
  • 11. Sister Chromatids = the two identical parts on a chromosome Centromere = the middle part that holds the sister chromatids together
  • 12. Interphase <ul><li>G2 Phase = “gap 2” phase </li></ul><ul><ul><ul><ul><li>Second growth stage </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Organelles needed for Mitosis are formed </li></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Centrioles and Spindle Fibers </li></ul></ul></ul></ul></ul>
  • 13. Interphase Summary <ul><li>G1 : cell growth </li></ul><ul><li>S phase : DNA is </li></ul><ul><li>copied </li></ul><ul><li>G2 : cell prepares </li></ul><ul><li>for division </li></ul>
  • 14. M Phase (Mitosis) <ul><li>One division of the cell nucleus to produce two new daughter cells </li></ul><ul><li>Has four phases (PMAT): </li></ul><ul><ul><ul><li>P rophase </li></ul></ul></ul><ul><ul><ul><li>M etaphase </li></ul></ul></ul><ul><ul><ul><li>A naphase </li></ul></ul></ul><ul><ul><ul><li>T elophase </li></ul></ul></ul>
  • 15. 1. PROPHASE <ul><li>Chromosomes appear </li></ul><ul><li>Centrioles move to opposite ends of the cell </li></ul><ul><li>Chromosomes attach to the spindle </li></ul><ul><li>Nucleolus and nuclear membrane breaks down </li></ul>
  • 16. 2. METAPHASE <ul><li>Chromosomes line up at the center or (middle) </li></ul>
  • 17. 3. ANAPHASE <ul><li>Centromeres split </li></ul><ul><li>Sister chromatids separate to form individual chromosomes </li></ul><ul><li>Anaphase ends when the movement of chromosomes stops </li></ul>
  • 18. 4. TELOPHASE <ul><li>Chromosomes uncoil into chromatin </li></ul><ul><li>Nuclear membrane reforms </li></ul><ul><li>Spindle breaks apart </li></ul>
  • 19. 5. CYTOKINESIS <ul><li>The cytoplasm of the cell divides </li></ul><ul><li>Forms two daughter cells that are exactly like the parent cell (each have one complete set of chromosomes) </li></ul>
  • 20. Wrap-Up <ul><li>Which part of interphase involves copying DNA ? </li></ul><ul><li>Which stage of Mitosis involves chromosomes lining up at the middle ? </li></ul><ul><li>What are chromosomes made up of? </li></ul>

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