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Mitosis

Mitosis

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  • {"21":"A mnemonic to help remember the stages of mitosis.\n"}

Mitosis ppt Mitosis ppt Presentation Transcript

  • How do little elephants grow up to be BIG elephants?
  • M: mitosis (Cell divides) G2: Cell doublechecks to make sure DNA is replicated and cell has enough organelles for the upcoming split G1: Cell grows in size. S: Cell makes identical copy of its DNA
  •      What are the three phases of Interphase? What happens during S phase? What happens during G1 phase? What happens during M phase? What happens during G2 phase? View slide
  • Animated Mitosis Cycle http://www.cellsalive.com/mitosis.htm • Interphase • Prophase • Metaphase • Anaphase • Telophase & Cytokinesis http://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi? View slide
  •  What is binary fission?  Why does the DNA need to move to either side of the cell before the cell divides?
  • • • Chromosomes are copied (# doubles) Chromosomes (DNA) appear as threadlike spaghetti called chromatin
  • Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  • • • • • 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.
  • Animal Cell Plant Cell Spindle fibers Centrioles Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  • • Chromatids (a pair of identical chromosomes) are dragged to middle of cell along the metaphase plate. Centromere
  • Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  • • Chromatids (or pairs of identical chromosomes) separate and begin to move to opposite ends of the cell. Sister chromatids
  • Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  •  What are the steps of mitosis?  What is the spaghetti –like DNA called?  What is the coiled, bundled DNA called?
  • • • • Two new nuclei form. Chromosomes unwind into chromatin (threads rather than rods). Mitosis ends.
  • Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
  • • Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.
  • Animal Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase
  • Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase
  • 22
  • - Cell Division 23 23
  • http://www.cellsalive.com/mitosis.htm