1. “Cell division is part of the cell cycle”
Section 3.2 & 3.3

2. Do Now C A B Label the following diagram 1- chromosome 2- chromatid
3- centromere C A B

3. Objectives Describe the main events of the cell cycle
Differentiate interphase from mitosis
Construct a cell cycle model from paper plates.

4. Cell Cycle Two main phases: Interphase & M-phase (Mitosis)
The normal sequence of development and division of a cell
Two main phases: Interphase & M-phase (Mitosis)

5. Interphase G1: organelles duplicate, cell grows
There is no division in interphase, just growth.
G1: organelles duplicate, cell grows
S: DNA replicates (is copied)
G2: cell grows, prepares to divide

6. M-phase (Mitosis)
Mitosis: Cellular Division (Nuclear Material divides!)
PMAT+ C
Prophase
Metaphase
Anaphase
Telophase
Cyokinesis

7. M I T O S
I S

8. Mitosis
Creates 2 genetically IDENTICAL daughter cells.

9. Prophase DNA condenses to form chromosomes.
Each chromosome has 2 chromatids and a centromere
The nuclear membrane disappears

10. Metaphase – “Middle”
Chromosomes line up in the middle of the cell at the “equator”

11. Anaphase – “away” Chromatids split
Spindles pull to opposite sides of the cell AWAY from each other

12. Telophase
2 Nuclei form
Nuclear membrane forms around each group of chromosomes.
The chromosomes become chromatin again.

13. Cytokinesis Division of the cytoplasm.
Occurs differently in plant and animal cells.
2 New daughter cells!

15. Cytokinesis Animal Cells:
Membrane pinches together and forms a cleavage furrow until the cells separate.

16. Cytokinesis Plant Cells:
Cell plate forms which becomes the cell wall and divides the two cells.

17. Do Now Please hand in your homework in the bin. Then answer:
What does asexual reproduction mean?
What are some examples of asexual reproduction that you can think of?

18. “Both sexual and asexual reproduction involve cell division”
Most unicellular organisms use cell division to reproduce through asexual reproduction.
Asexual Reproduction: one organisms produces one or more new organisms that are identical to itself and that live independently of it
Live independently of parent
Ex. New skin cells are part of skin tissue and cannot live independently!

19. Asexual Reproduction: Binary Fission
A form of asexual reproduction in prokaryotes.
The parent organism splits in two, creating two independent daughter cells.
Genetically all the same!
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20. Asexual Reproduction: Budding
Budding- Tiny Buds on organisms body!
Genetic material the same!
Detaches when it reaches a certain size
Both Unicellular and Multicellular organisms can reproduce by budding.
Ex. Unicellular- Some Yeast
Multicellular - Hydra
Hydra

21. Asexual Reproduction: Regeneration
The process of new tissue growth at sites with wounds or lost limbs.
Asexual Reproduction: Regeneration

22. Bacteria Many bacteria have a very short generation time.
Some can have a new generation of cells in less than 30 min.
Ex: E. Coli can double every 20 minutes.
Why you get sick so fast!