1. Science Starter How does an asexual organism reproduce?
Name the three reasons that a cell divides.
What is cellular division?
Why is it important that we have cell division?

2. Agenda Test on Reproduction (7.L.2.1) on THURSDAY
Notebook Check on THURSDAY
Mitosis (Wednesday, Thursday, Friday)
Meiosis (Monday, Tuesday)
Agenda

3. CELL DIVISION…The two types
Mitosis
Meiosis
Asexual Cell Division
Creates 2 daughter cells that have the exact same DNA
A cell with 46 chromosomes creates 2 cells with 46 chromosomes each
Creates Somatic (Body) Cells
Creates DIPLOID Cells
Sexual Cell Division
Used to create GAMETES (sex cells— Egg and Sperm)
Creates 4 daughter cells that have half the amount of DNA
A cell with 46 chromosomes creates 4 cells with 23 chromosomes each
Creates Haploid Cells
CELL DIVISION…The two types

4. What is mitosis?
Mitosis is the process that divides the cell’s nucleus into two, each with a complete set of genetic material from the parent cell.
4 phases

5. Nucleus: Organelle that is the “command center” of the cell and contains all the genetic information
Surrounded by a Nuclear Membrane
Chromosome: threadlike structure that carries the genes (aka DNA)
In the NUCLEUS
Vocabulary Recap

6. Mitosis is used for….
CD is GRREAT!!!
Remember the tool?

7. CD is GRReat! CD is Cell Division G is Growth R is Repair
R is Reproduction
CD is GRReat!

8. Interphase Cell is at rest.
At the end of Interphase, cells grows in size and replicates (doubles) its DNA.
Interphase

9. 1. Prophase Chromosomes condense and the nuclear membrane disappears.
Late Prophase
Early Prophase
1. Prophase

10. Chromosomes line up in the center of the cell.
2. Metaphase

11. Chromosomes separate.
Early Anaphase
3. Anaphase
Late Anaphase

12. New nuclei form containing exact copies of the original cell’s DNA.
4. Telophase

13. The cell pinches in the middle and divides into two daughter cells.
Cytokinesis

14. Quick Videos http://www.youtube.com/watch?v=rgLJrv oX_qo
v-uZYI
Quick Videos

15. Prophase
Metaphase
Anaphase
Telophase
….Cytokinesis
PMAT…C

16. What do you think? Mitosis is: Asexual Reproduction? OR
Hint:
Asexual--one cell makes two identical offspring
Sexual--two cells make genetically different offspring
What do you think?

17. A student will be bringing around science textbooks. Turn to page C83.
You will also receive a foldable.
Label the top flap, “STAGES of MITOSIS”
Mitosis Foldable

18. Mitosis Foldables You will create five flaps to represent
PMAT….C
Use a pencil and two different colored markers from the bins.
When you are done with the markers, please put them back in my box.
Turn your foldables into me! I will return them.
Mitosis Foldables

19. Exit Ticket
Mitosis is the process that divides the cell’s nucleus into __________.
A. 3
B. 2
C. 1
D. 4
List out the different stages of mitosis in correct order.
Explain what happens in Anaphase.