1. The phenomenon of cell division
MITOSIS
The phenomenon of cell division

2. MITOSIS Need for Cell Division
Which cells do you think divide rapidly in the human body?

3. Mitosis
Form of asexual reproduction
End result:

4. Some Terminology! Chromatin Chromosome Duplicated chromosome A gene
Chromatids
Centromere
Duplicated chromosome

5. Double-stranded DNA helix Chromatin Chromosome
DNA helix wraps around protein and creates chromatin
Chromatin continues to fold and coil
Chromatin
Chromosome

6. Humans have 46 chromosomes!

7. Homologous chromosomes
We have 23 pairs of chromosomes (one from your dad and one from your mom) in each cell
Homologous chromosomes
Homologous chromosomes: blue from dad, red from mom
DNA replication forms double-stranded chromosomes

8. Overview of Cell Cycle

9. Interphase 3 STAGES: G1 phase – growth and preparation
for DNA replication
S phase – synthesis of DNA material
G2 phase – final preparations before mitosis
Centrioles
Chromatin

10. Prophase

11. Metaphase

12. Anaphase

13. Telophase

14. Cytokinesis

15. Differentiation If all cells undergo mitosis, how do you
get different types of cells in the body?
DIFFERENTIATION

16. Cell division out of control!
Result: Abnormal cells that can show the following characteristics