Mitosis

1
Mitosis
2
Interphase

• Not technically part of mitosis
• Cell spends 99 time in this phase
• DNA exists in ___________ form
• Cell performs..?
• Most important Fact

3
Prophase

• Events of Prophase

4
Prophase

• Is the cell to the left a human cell?
• How many chromosomes are pictured?
• Are the chromosomes normal size or duplicated?
• Which pieces of DNA are identical to each other?

5
Metaphase

• The duplicated chromosomes line up along the
  equator of the cell.
• What causes them to move?

6
Metaphase

• How many chromosomes are pictured?
• Are the two red Xs identical to each other?

7
Anaphase

• Spindle fibers split the duplicated chromosomes
  in half.
• The identical chromatids are separated from each
  other. But now they are normal sized
  chromosomes!
• Will the two daughter cells be genetically
  identical?

8
Telophase

• Telophase is called reverse prophase because..

9
Telophase

• In telophase, cytokinesis occurs.
• Cytokinesis -

10
Telophase

• Q Are the two daughter cells genetically
  identical to each other????
• Clones -

11
MITOSIS BIG IDEAS

• Occurs in all eukaryotic organisms
• Each chromosome is copied. (how?)One copy of
  each chromosome is distributed to both daughter
  cells.
• Thus ? All body cells contain full set of
  chromosomes (therefore full set of genes)

12
Questions

• When do cells mitose?
• What determines when cells start and stop
  mitosing?
• Can you think of a medical condition in which you
  would like human cells to mitosis, (but they
  normally dont)?