1. Quiz on Mitosis Web Activity Check Planaria Mitosis Notes
November 16, 2010
Quiz on Mitosis Web Activity
Check Planaria
Mitosis Notes

2. Homework Read section 10-1 (pages 240-243) in your textbook
Answer Learning Targets #1-3 in complete sentences

3. Notes- Cell Division: Mitosis
Mitosis Notes

4. CELL DIVISION
One cell divides into 2 identical daughter cells (same genetic information).
Asexual reproduction- go through stages of division
Mitosis – division of the nucleus
Cytokinesis – division of the cytoplasm

5. Make a pie graph of your 24-hour day…

6. What percentage of a cell’s life is dedicated to division?

7. Mitosis- Cell is dividing
Interphase- Cell is NOT dividing

8. Cell cycle = Life span of the cell
G1 phase – cell grows, makes more organelles and proteins
S phase – genetic material replicates (S = synthesis = “to make”)
G2 phase – molecules and organelles required for cell division produced
M phase – mitosis and cytokinesis
G1 phase
S phase
G2 phase

9. Cell cycle = Life span of the cell cont…
G1, S and G2 make up INTERPHASE. Cell spends a majority of its life in this phase.
M phase is CELL DIVISION. This is a relatively small portion of the cell’s life.

10. MITOSIS
4 phases of nuclear division- PMAT

11. Mitosis consists of four phases
Prophase
Metaphase
Anaphase
Telophase

12. INTERPHASE S- genetic material copied “resting” phase includes G1,S,G2
cell is NOT dividing

13. Prophase- condense Longest phase of mitosis Chromosomes become visible
Centriole pairs begin to separate
Spindle fiber forms (made of microtubules)
Nuclear envelope breaks down
Spindle begins to attach to chromosomes at the centromere

14. Metaphase- line up
Chromosomes line up across center of the cell (“equator” or “metaphase plate”)
Centromere connected to the spindle fibers
Centriole pairs at opposite ends of the cell

15. Anaphase- split Sister chromatid split apart
Chromosomes get pulled to opposite poles by the shrinking spindle fibers
Chromosomes form “V” shape as they get dragged through the cytoplasm

16. Telophase- 2 new nuclei Chromosomes re-condense
Nuclear envelope reforms around each set of chromosomes at opposite ends of the cell
Spindle fiber breaks apart
2 nuclei are formed

17. Cytokinesis division of the cytoplasm
2 new daughter cells are formed with the same number of chromosomes as the original cell.

18. Practice… Number your paper #1-4.
Label each slide with the correct phase of mitosis

19. Nuclear membrane breaks down; Chromosomes condense; Centrioles migrate
WHICH PHASE?
Prophase

20. on cell equator; Spindle fibers attach to kinetochores
Chromosomes align
on cell equator; Spindle fibers attach to kinetochores
Metaphase

21. Sister chromatids separate as they are
pulled by spindle fibers.

22. Nuclear membrane reforms; Chromosomes decondense; centrioles dissolve
Cytokinesis is the last event in cell division; however it is not considered
to be a part of mitosis, since
It does not involve the nucleus.
Telophase

23. Video of Mitosis http://www.cellsalive.com/mitosis.htm
Cell Cycle and Mitosis
Mitosis and Cytokinesis