1. Cell Division and Mitosis
Chapter 8 Section 1 p

2. A. Cell Division
Increases the number of cells and causes many celled organisms to grow

3. A. Cell Division
1. Cells have periods of formation, growth, development, and death called life cycles

4. A. Cell Division
2. Interphase- most of the life of any eukaryotic cell (or cell with a nucleus and organelles) is spent in a period of growth and development.

5. 2. Interphase
A. Chromosome- Structure in the nucleus that contains heredity material

6. 2. Interphase
A. Chromosome- Structure in the nucleus that contains heredity material
B. During interphase, a cell duplicates its chromosomes and prepares for cell division.

7. 2. Interphase
A. Chromosome- Structure in the nucleus that contains heredity material
B. During interphase, a cell duplicates its chromosomes and prepares for cell division.
C. After interphase, the nucleus divides and then the cytoplasm separates to form two new cells

8. B. Mitosis
Process in which the nucleus divides to form two identical nuclei

9. B. Mitosis
Occurs after interphase
4 distinct steps
“PMAT” to help
remember
Process in which the nucleus divides to form two identical nuclei
4 steps of Mitosis

10. B. Mitosis 1st step Prophase
a. nucleolus and nuclear membrane disintegrate

11. B. Mitosis 1st step Prophase
a. nucleolus and nuclear membrane disintegrate
b. Centrioles move to opposite sides of the cell.

12. B. Mitosis 1st step Prophase
a. nucleolus and nuclear membrane disintegrate
b. Centrioles move to opposite sides of the cell.
c. Spindle fibers begin to stretch across the cell

13. B. Mitosis 2nd step Metaphase
Pairs of chromatids line up across the center of the cell
(they meet in the middle)

14. B. Mitosis
3rd step Anaphase
a. Each centromere divides

15. B. Mitosis 3rd step Anaphase a. Each centromere divides
b. Each pair of chromatids separates and moves to opposite ends of the cell

16. B. Mitosis
4th step Telophase
Spindle fibers disappear

17. B. Mitosis 4th step Telophase Spindle fibers disappear
A new nucleus forms in each cell
Cells separate (cytokinesis)

18. C. Results of Mitosis
1. Each cell in your body (except sex cells) has the same number of chromosomes- 46

19. C. Results of Mitosis
1. Each cell in your body (except sex cells) has the same number of chromosomes- 46
2. Allows for growth and replaces worn out or damaged cells

20. D. Asexual Reproduction
A new organism is produced from one parent organism
3 types
Fission
Budding
Regeneration

21. D. Asexual Reproduction
1. Fission- An organism with no nucleus divides into two identical organisms by fission
Example: bacteria

22. D. Asexual Reproduction
2. Budding- A small exact copy of the adult grows from the body of the parent
Example: hydra

23. D. Asexual Reproduction
3. Regeneration, a whole new organism grows from a piece of the parent
Example: sea star