1. Mitosis Cell Division in Non Sex Cells
Nucleus divides = Two identical cells produced

2. Prophase During prophase, structures called centrioles move to opposite ends of the cell and thread-like spindle fibers begin to stretch across the cell.

3. Metaphase In metaphase, the chromosomes line up along the center of the cell and two spindle fibers, one from each end of the cell, attach to the centromeres.

4. Anaphase During anaphase, the centromeres divide and identical DNA molecules go to opposite sides of the cell.

5. Telophase During telophase the spindle fibers disappear and a new nuclear membrane forms around each set of DNA molecules

6. Gamete Formation = Egg Cells with ½ the chromosomes
Meiosis
Gamete Formation = Egg Cells with ½ the chromosomes

7. Meiosis I Begins Prophase I Chromosomes pair up and can exchange genetic material

8. Metaphase I Chromosome pairs line up in the middle of the cell

9. Anaphase I Chromosome pairs separate and move to opposite ends of the cell

10. Telophase I and Cytokinesis Nuclear membranes form around each set of chromosomes and the cell divides into two daughter cells. Each daughter cell has half the number of chromosomes as the parent cells, but each chromosome is still made up of two strands of DNA held together at the centromere

11. Meiosis I – Results in two cells with two replicated chromosomes

12. Meiosis II Begins Prophase II The nuclear membrane in the daughter cells breaks down

13. Metaphase II Chromosomes line up in the middle of the cell

14. Anaphase II The DNA molecules held together by the centromere separate and move to opposite ends of the cell

15. Telophase II and Cytokinesis Nuclear membranes form around each set of DNA molecules and split into four daughter cells that contain half the number of chromosomes as the parent cell