1. Mitosis is cell division in somatic cells
Mitosis is cell division in somatic cells. Somatic cells = All the cells in your body that are not sex cells (eggs and sperm)
Mitosis

2. Why?
Unicellular organisms use it to reproduce.
Mitosis

3. Why?
Multicellular organisms use it for
growth

4. Why?
Multicellular organisms use it to repair tissues

5. Muscle and Nerve tissues do not normally do mitosis.
Eric LeGrand – Rutgers

6. Stem cells are cells that do mitosis, then the daughter cells undergo differentiation to become a specific type of cell in the multicellular organism.

7. Cancer is uncontrolled mitosis with no differentiation.
Licentious division - prostate cancer cells during division.

8. A cell’s life:

9. DNA is Packaged into Chromosomes
chromatin
duplicated
chromosome
The packaging is impressive – 2 meters of human DNA fit into a sphere about meters in diameter.

10. Genes, Mitosis and Cytokinesis
4/25/2017
DNA replication:
It happens during INTERPHASE.
G. Podgorski, Biol. 1010

11. The Link Between DNA Replication and Chromosome Duplication

12. DNA is Condensed into Visible Chromosomes Only For Brief Periods in the Life of a Cell
95% of the time, DNA is like this.
CHROMATIN
SISTER CHROMATIDS:
Duplicate chromosomes bound together by a centromere.

13. During Mitosis
Chromosomes divide.
Cytokinesis occurs

14. There are 4 steps, or phases of mitosis:
Prophase
Metaphase
Anaphase
Telophase

15. replication is completed.
interphase
prophase
metaphase
Interphase – DNA
replication is completed.
Prophase – Chromosomes shorten and thicken, centrioles appear, nuclear membrane disintegrates.
Metaphase – chromosomes line up on equatorial plate in middle of cell.

16. Genes, Mitosis and Cytokinesis
4/25/2017
Anaphase – chromatids are pulled
apart, chromosomes pulled to
opposite sides of the cell
Telophase – Cytokinesis
occurs, cell returns to
normal.
G. Podgorski, Biol. 1010

17. Mitosis in Action
Blue shows DNA, green shows spindle fibers.

18. In Animal Cells, a Cleavage Furrow Forms and Separates Daughter Cells during cytokinesis.
Cleave furrow in a dividing frog cell.

19. A cell plate forms between two plant cells to separate them.

20. http://www.youtube.com/watch?v=VlN7K1- 9QB0