Cell CycleCell Division

1
Cell Cycle/Cell Division

• Mitosis and cytokinesis

2
Mitosis

• Growth Somatic (body) cells undergo mitosis for
  growth.
• Maintenance Somatic cells use mitosis to repair
  damage.
• Asexual Reproduction Mitosis is the process
  used by some organisms to reproduce
  (budding,etc)

3
Steps to Mitosis

• Interphase
• Steps to Mitosis
• Prophase
• Metaphase
• Anaphase
• Telophase
• Cytokinesis

4
Interphase

• 1- DNA replication
• 2- transcription and translation (normal cell
  growth)

5
Prophase

• Chromatins condense
• Nuclear envelope dissolves freeing DNA in the
  cell.
• Animal cells only
• Centrioles form spindle fibers

6
Metaphase

• Metaphase Plate (chromosomes line up in the
  middle of the cell)
• Highly organized so that both new cells will get
  exactly the same DNA
• Spindle fibers completely attached to centromeres

7
Anaphase

• Paired chromosomes are pulled to opposite sides
• Each chromosome is an exact copy of one original
  chromosome.
• Each end is considered a polar end.

8
Telophase

• Chromatids end up at separate poles, spindle
  fibers begin to dissolve
• Nuclear envelopes begins to form
• Cell starts to pinch off through cytokinesis

9
Cytokinesis

• Division of all the rest of cellular organelles
  into two identical daughter cells.
• Animal Cells Actin forms around the center of
  the cell and contract pinching off two cells.
• Plants Cells New cell plate created between the
  two cells.

10
(No Transcript)
11
Mitosis Animation

• http//www.biology.arizona.edu/cell_bio/tutorials/
  cell_cycle/cells3.html