MITOTIC CELL DIVISION

1
MITOTIC CELL DIVISION

• Cell Reproduction Without Sex

2
Cell Life Cycle

• cell life cycle includes a period of growth and
  preparation for cell division (blue). This period
  is called Interphase.
• mitosis is the period of time that the cell
  spends reproducing.

3
Plant Cell Mitosis

• the many stages of the cell life cycle can be
  seen in the image to the right
• the process of cell reproduction includes
  prophase, metaphase, anaphase and telophase

4
Interphase

• longest phase of life cycle
• G1 phase of rapid growth and increase in
  protein and cell RNA
• S synthesis phase when DNA duplicates
• G2 - phase of organelle development and growth
  in preparation for cell division

5
Prophase

• chromosomes appear
• the nucleolus disappears
• the nuclear membrane begins to break down

6
Very Late Prophase

• nuclear membrane has disappeared
• chromosomes start to move to the equator of the
  cell
• each chromosome has two identical chromatids

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Metaphase

• chromosomes align along the equator of the cell
• spindles that are attached to the poles connect
  to the centromeres

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Early Anaphase

• chromosomes are pulled to the poll by the
  contraction of the spindle fibers
• chromatids are separated at the centromere

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Late Anaphase

• chromosomes begin to congregate at the poles
• the energy for this process if provided by the
  mitochondria

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Early Telophase

• the new cell wall begins to form to separate the
  new cell
• the chromosomes begin to form a nucleus

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Late Telophase

• the chromosomes start to uncoil and become less
  dense
• two new identical cells are formed

12
Mitosis Review

• all four stages of mitosis can be seen in this
  picture.
• note the process by which the red and blue
  chromosomes separate.

13
Interactive Mitosis Tutorial
This is an excellent interactive mitosis
animation tutorial for high school biology
students. http//www.sci.sdsu.edu/multimedia/mitos
is/
14
Credits

• Bruce, Anne http//www.microscopy-uk.org.uk/mag/a
  rtaug99/mitosis.html , Microscopy UK, August 1999.