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Mitosis

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Mitosis & Cell Division Why Divide? Cell Cycle Mitosis The process in which a cell divides to produce two daughter cells. Both daughter cells are genetically ... – PowerPoint PPT presentation

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Title: Mitosis


1
Mitosis Cell Division

2
Why Divide?
3
Cell Cycle
4
Mitosis
  • The process in which a cell divides to produce
    two daughter cells.
  • Both daughter cells are genetically identical
    copies of the parent cell and have the same
    number of chromosomes.
  • Focuses on what chromosomes do during cell
    division. During mitosis, chromosomes occur in
    like-pairs and are referred to as homologous.

5
Figure 12.3 Chromosome duplication and
distribution during mitosis
6
Interphase
  • resting phase
  • Cell is going through normal activities, but is
    resting from division.
  • When ready to begin dividing the chromosomes
    duplicate and DNA is replicated.

7
Prophase
  • mitosis begins
  • chromosomal material condenses into thread-like
    chromosomes
  • nuclear membrane and nucleolus break up
  • in animal cells centrioles divide and begin to
    move to the poles (no centrioles in plant cells)
  • spindles appear

8
Metaphase
  • Chromosome pairs move towards the center and line
    up on the equator of the cell
  • A spindle fiber attaches to each of the
    centromeres of the chromosomes

9
Anaphase
  • paired chromatids separate and are pulled apart
    by the spindle fibers to the poles
  • daughter chromosomes are created (division of
    genetic material)

10
Telophase
  • clean up stage
  • a nuclear membrane and nucleolus reappear
  • chromosomes unwind
  • Spindle fibers disappear

11
Cytokinesis
  • Once mitosis is completed (in the animal cell),
    the cytoplasm splits
  • Two genetically identical daughter cells are
    produced
  • Next, the two new cells each begin the cell cycle

12
Cell Division
Plant cell
Animal cell
13
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