1. Cell Cycle and Cell Division

2. BIG PICTURE

3. Mitosis 2n 2n 2n One (Diploid) Cell becomes Two (Diploid) Cells
Example : Cats
Somatic Cells have 38 (2n) chromosomes
Sex cells have 19 (n) chromosomes

4. Chromosomes Contain the genetic information
How this information is transmitted from one cell to another
2 sister chromatids
DNA Replication
Centromere
Arm
Genes/DNA
Chromosome
(unduplicated)
Chromosome
(duplicated)

5. A Chromosome

6. Number of Chromosomes Types of Chromosomes (Humans)
Body (Autosomes) – 44 chromosomes (22 pairs)
Sex – 2 chromosomes (1 pair)
(females XX, males XY)
Total Number of Chromosomes = 46

7. Cell Cycle Two main phases: Interphase 3 stages
G1 – rapid growth
S – DNA replication
G2 – prepare for mitosis
2. Mitosis (M) = cell division
4 stages
Prophase
Metaphase
Anaphase
Telophase

8. Mitosis
Interphase
Cytokinesis
Telophase
Prophase
Anaphase
Metaphase

9. Interphase
DNA replication
All chromosome have two sister chromatids

10. Prophase Chromosome formation DNA condenses Nuclear membrane dissolves
Centrioles move to opposite poles of cell

11. Metaphase Centromere of chromosomes joins to spindle fiber
Chromosomes line up in the middle of the cell

12. Anaphase Centromere doubles
Chromatids separate and are pulled to opposite poles by the spindle fibers

13. Telophase Cytokinesis – separation of cytoplasm;
Nuclear membrane reappears in the two daughter cells
Cytokinesis – separation of cytoplasm;
final stage of cell division

14. Mitosis under the microscope
PROPHASE
TELOPHASE
METAPHASE
ANAPHASE

15. Mitosis Lab –Root Tip
Telophase
Prophase
Anaphase
Metaphase
Interphase

19. Vocabulary
The Cell Cycle Chromosomes Interphase Mitosis Prophase Metaphase Anaphase Telophase Cytokinesis

20. Homework
Page 44
Questions #1 - 7

21. Mitosis On the Table
Using pipe cleaners and your text, recreate the stages of mitosis on your desk with a partner
1 partner tries each phase, and the other partner checks to make sure it’s done correctly
Raise your hand for teacher to check
Then switch roles