1. 6-2 Notes: Mitosis and Cell Cycle

2. Division in Eukaryotes
Two types of Cell Division for eukaryotes:
Mitosis and Meiosis

3. Mitosis (Division of the nucleus)
Occurs in organisms undergoing growth, development, and repair
One cell division
Makes 2 new cells identical to the original cell
Makes somatic cells
Makes diploid cell (2n)

4. Meiosis
Meiosis (gamete production) = Occurs during the reproduction of gametes (sex cells)
Two cell divisions
makes 4 new cells with half the genetic material of the original
Makes sex cells
Makes haploid cells (n)

6. Cell Cycle
Cell Cycle = A repeating cycle of events in the life of a cell

7. Cell Cycle
Interphase = the period between cell divisions (made of 3 phases)

8. Cell Cycle
Interphase = the period between cell divisions (made of 3 phases)
G1 = the growth phase, a new cell grows to mature size
S = DNA is copied or synthesized to prepare for division
G2 = the time when the cell prepares for division

9. Cell Cycle
Optional**) G0 = following G1 a cell can exit the cell cycle and prevent further cell division
Ex/ Developed nerve cells enter G0 so nerve cells can not divide to repair damage

10. Mitosis Phases Mitosis divides the cell’s nucleus in four phases.
Prophase
Metaphase
Anaphase
Telophase

11. Mitosis Phases
1. Prophase: Chromosomes condense, nucleus breaks down, and spindle fibers form

12. Mitosis Phases
2. Metaphase: Chromosomes line up in the middle of the cell

13. Mitosis Phases
3. Anaphase: sister chromatids separate to opposite sides of the cell.

14. Mitosis Phases
4. Telophase: The new nuclei form, spindle fibers break down, and chromosomes begin to uncoil.

15. Mitosis Phases
Cytokinesis: division of the cytoplasm

16. Sequence of Cell Cycle G1 S  G2 M (Mitosis) C (Cytokinesis)
INTERPHASE CELL DIVISION

17. Cell Cycle Brace Map

18. Classwork Cell Cycle Drawing pg 155 Draw and label each phase
Mitosis Flipbook use page 156
Name each phase
Draw and label cells at each cell
Describe each phase