2010-2011 Science: 3-4 Cell Growth and Division

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2010-2011 Science: 3-4 Cell Growth and Division
2011-10-10 19:27:58
2010 2011 Science Cell Growth Division

Science; Mrs Deschene; Chapter 3 Lesson 4; Cell Growth and Division; For Test on December 10, 2010
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  1. Phase 6: Two Daughter Cells Form

    -called cytokinesis
    -the division of cytoplasm in the cell
    -the membrane surrounding the cell begins to move inward until the cytoplasm is pinched into two nearly equal parts
    -each part contains a nucleus with identical chromosomes
    -the cell membrane forms and two new daughter cells are produced
    -in plant cells, a cell wall forms
  2. Phase 5: Two New Nuclei Form

    -called telophase
    -chromosomes begin to uncoil and lose their rodlike appearance
    -the chromosomes again become the chromatid and a nuclear membrane forms around the chromatin at each end of the cell
    -in each nucleus a nucleolus reappears
    -the process of mitosis is now complete
  3. Phase 4: Chromosomes Begin to Separate

    -called endophase (SP?)
    -one chromatid moves to one end of the cell along the spindle
    -the other chromatid goes the other direction
    -the chromatids are again called chromosomes
  4. Phase 3: Chromosomes Attach to the Spindle

    -called metaphase
    -chromosome attach to the spindle (the "bridge")
    -chromosomes are attached to the spindle by the centromere, which connects each chromatid to its identical sister
  5. Phase 2: Mitosis Begins

    -called prophase
    -the process of cell division is now called mitosis
    -prophase (mitosis) is the process in which the nucleus of a cell divides
    -the threadlike chromatin in the nucleus begin to shorten and form rodlike chromosomes
    -two centrioles (only in animal cells) begin to move to opposite sides of the cell
    -a mesh-like spindle begins to develop between the two centrioles forming a "bridge" between opposite ends of the cell
    -the nuclear membrane begins to breakdown, and the nucleolus disappears
  6. Phase 1: Chromosomes Are Copied

    -Called Interphase
    -the cell is preforming its life functions, but isn't actually dividing
    -chromosomes would appear in threadlike coils called chromatin
    -in animal cells, two structured called centrioles can be seen outside the nucleus, they play a part in cell division
    -plant cells don't have centrioles
    -chromosomes duplicate (numbers are doubled)
    -each chromosome is attached at an area called the centremere
    -the sister chromosomes are now called chromatids
  7. Cell Division

    During cell division one cell divides into to new cells
    -Each new cell, called a daughter cell, is identical to the other daughter and parent cell
    -Cell division occurs in a series of stages, or phases
  8. Limits On Cell Growth

    At some point the cell membrane would not be able to handle the flow of materials passing through it