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Mitosis Notes 7th grade level

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What are the steps of mitosis? Eukaryotic ell division. Plant mitosis.

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Mitosis Notes 7th grade level

  1. 1.  When you see green text – read carefully – copy if you want  When you see white text – ALL students copy  When you see yellow text – Honors students copy
  2. 2. How do little elephants grow up to be BIG elephants?
  3. 3. • Multicellularity • We all start out as a single cell • Key Concept: Growth occurs when more cells are made, NOT because cells get bigger.
  4. 4. Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun.
  5. 5. Mitosis Notes • Interphase • Prophase • Metaphase • Anaphase • Telophase & Cytokinesis The cell life cycle consists of: Don’t draw this
  6. 6.  What are the three phases of Interphase?  What happens during G1 phase?  What happens during S phase?  What happens during G2 phase?
  7. 7. • Chromosomes are copied (# doubles) • Chromosomes (DNA) appear as threadlike spaghetti called chromatin Draw this
  8. 8. Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Don’t draw thisDon’t draw this
  9. 9. • Nucleus starts to disappear. • Chromatin coils to become chromosomes. • Centrioles (or poles) appear and begin to move to opposite end of the cell. • Spindle fibers form between the poles. centriole Draw this
  10. 10. Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Spindle fibers Centrioles Don’t draw thisDon’t draw this
  11. 11. • Chromatids are dragged to middle of cell along the metaphase plate. Centriole Don’t draw this
  12. 12. Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Don’t draw this Don’t draw this
  13. 13. • Chromatids (or pairs of homologous chromosomes) separate and begin to move to opposite ends of the cell. Sister chromatids Draw this
  14. 14. Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Don’t draw thisDon’t draw this
  15. 15.  What are the steps of mitosis?  What is the spaghetti –like DNA called?  What is the coiled, bundled DNA called?
  16. 16. • Two new nuclei form. • Chromosomes unwind into chromatin (threads instead of bundles). • Mitosis ends. Draw this
  17. 17. Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Don’t draw this Don’t draw this
  18. 18. • Cell membrane moves inward to create two daughter cells – each with its own nucleus. Draw this
  19. 19. Cytokinesis is different in plants! The cell wall makes plant cells rigid, so they can’t move inward and separate like animal cells can. Vesicles filled with cell wall parts are towed to the middle of the cell. They fuse together, forming a “cell plate.” The cell plate becomes the new cell wall. Honors draw this
  20. 20. Animal Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase Don’t draw these – study them carefully
  21. 21. Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase Don’t draw these – study them carefully
  22. 22. • IInterphase I • PProphase Pray • MMetaphase More • AAnaphase At • TTelophase The • CCytokinesis Church REMEMBER ALL THE STEPS OF MITOSIS!
  23. 23. 26
  24. 24.  What is binary fission?  Why does the DNA need to move to either side of the cell before the cell divides?
  25. 25.  What is binary fission?  Binary fission is bacteria’s version of cell division.  Why does the DNA need to move to either side of the cell before the cell divides?  DNA needs to be on opposite sides of the cell because when the cell splits in two each new cell needs its own copy of DNA
  26. 26. 29 Quiz time! Can you fill in the blanks? 29
  27. 27. http://www.cellsalive.com/mitosis.htm

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