1. Meiosis

2. Mitosis quiz What phase do the chromosomes line up in the middle?
Metaphase
What phase does the DNA condense into chromosomes?
Prophase
What phase does the cell start to become two cells?
Telophase
What is the out come of mitosis?
Two identical daughter cells
What major purpose of mitosis?
Growth and repair

3. Purpose of Meiosis To create sex cells
In females: happens once in a life time to create all the eggs needed for the rest of their life.
In males: Happens constantly to replenish dying sperm cells.
Sex cells need ½ the amount of genetic information as normal cells

4. Meiosis in a nutshell
Meiosis goes through the steps of Mitosis twice with a little difference.
the difference in the first set of divisions is that the DNA is crossed and mixed up to make more different babies
The second difference is in the second division the DNA does not replicate.

5. Meiosis http://www.youtube.com/watch?v=D1_-mQS_FZ0

6. Meiosis part 1 Prophase DNA condenses into Chromosomes
Chromosomes switch segments

7. Prophase 1

8. Metaphase
Chromosomes line up in pairs

9. Anaphase 1
Chromosomes are pulled to the poles

10. Telophase 1
Two new cells start to form and the nucleus forms around the DNA to make 2 sister chromosomes that are NOT identical

11. Interphase 2 There are now 2 cells each with 46 chromosomes.
Nucleus is present

12. Prophase 2
Two cells
Chromosomes condense
Nucleus disappears

13. Metaphase 2
Chromosomes line up on the center of the cell

14. Anaphase 2 Chromosomes are pulled apart
Separating the chromosomes into 23 chromosomes

16. Telophase 2 Cells separate into 2
1 cell creates 4 daughter cells that are different genetically and have half the number of chromosomes a person needs