1. Cell Division

2. Cell Cycle:
Chromosome
Binary Fission:
Homologous Chromosome:
Chromatids
Centromere
Centriole
Mitosis
Cytokinesis

3. Vocabulary Cell Cycle: life cycle of a cell
Chromosome: Organized structures of DNA during the cell cycle- Humans have 46 chromosomes
Binary Fission: Process of cell division in which 1 cell simply splits into 2 (bacteria)
Homologous Chromosome: Chromosomes of matching information (pairs of chromosomes)- Humans have 23 homologous chromosomes
Chromatids: Identical copies of chromosomes
Centromere: Center that holds the chromatids together
Centrioles: Structure that assists in cell division
Mitosis: Process of nuclear division (2nd part of cell cycle)
Cytokinesis: Process of the cytoplasm dividing (3rd part of cell cycle)

4. How does the cell know how to divide?
Cell Division
Reproduction
Growth
Repair
Why do cells divide?
How does the cell know how to divide?
The DNA has the instructions
for all of the cell’s activities.

5. Cell Division PROKARYOTIC CELLS Bacteria EUKARYOTIC CELLS
Binary Fission
DNA make copies
Cell splits in two
EUKARYOTIC CELLS
Animal, Plant, Protists, Fungi
Cell Cycle
Three stage, multistep process to duplicate a cell

6. Cell cycle
Process in which new eukaryotic cells are formed from old cells
Life cycle of a cell

7. Cell cycle Consists of three stages
1. Interphase
2. Mitosis
3. Cytokinesis
Results in cells identical to parent cells

8. Cell Cycle 3 Parts The sequence of development and division of a cell
Interphase - Preparation
Mitosis – Cell division
Cytokinesis – Splitting
Adult human cell: ~24 hrs
18-20 hours in interphase
2 hours in mitosis
Embryonic cells: 30 min.
How long does it take?

9. 1. Interphase Cells grow and copy organelles and chromosomes
In-between phase

10. Interphase What happens Cell doubles in size DNA replicates
Organelles double in number

11. 2. Mitosis Process of nuclear division in cells
Occurs in eukaryotic cells
Four phases (PMAT)
Prophase
Metaphase
Anaphase
Telophase

12. PROPHASE (Pair) Nuclear membrane disappears
Chromatids form and pair up
Chromosomes are a pair of chromatids held together at the center with a centromere

13. Mitosis: PROPHASE What happens DNA forms chromosomes Spindle forms
Centrioles move toward opposite poles
Nuclear membrane begins to disappear

14. Metaphase (Middle)
Chromosomes line up in the middle of the cell

15. Mitosis: METAPHASE What happens Nucleus has disappeared completely
Chromosomes line up in the middle of the cell “equator”

16. Anaphase (Apart)
Chromatids pull apart

17. Mitosis: ANAPHASE What happens Centromeres divide
Chromatids separate and move to opposite poles

18. Telophase (two)
Form two nuclei
Nuclear membrane reforms

19. Mitosis: TELOPHASE What happens
Nuclear membrane forms around each group of chromosomes
Chromosomes unwind
Cytokinesis begins

20. 3. Cytokinesis Cytoplasm divides and forms two new cells In plants…
Cell plate forms to split into two
Cell plate becomes the new membrane/wall
In Animals…
Pinch apart to make two cells

21. Cytokinesis
Cytoplasm divides
One cell becomes 2 cells
What happens

22. MITOSIS SONG
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23. Mitosis Clips http://www.cellsalive.com/mitosis.htm