1. Cell Division
Chapter 10-2

2. I. Cell Division A. Cell reproduction
1. Results in 2 new daughter cells

4. B. Purpose of cell division:
1. to grow
2. To replace old and worn out cells
3. Repair damaged cells

5. II. Chromosomes A. Contain genetic information
1. DNA
B. Diff. organisms have a diff. # of chromosomes
1. Humans have 46
(23 from mom & 23 from dad)

6. C. Chromosome Structure 1. Chromatid = 1 copy of DNA
2. Sister Chromatids: 2 copies of the chromosome
a) sister chromatids are held together by a centromere

7. centromere
Sister chromatid
Sister chromatid

8. III. The Cell Cycle A. The life cycle of a cell 1. Major events:
a) Interphase (95%)
b) Mitosis (5%)
c) Cytokinesis
M Phase
M phase = cell division

9. The
Cell Cycle
M phase= cell division

10. B. Interphase
1. 3 phases:
a) G1 Phase
b) S Phase
c) G2 Phase

11. C. Mitosis: division of the nucleus
1. 4 phases
a) Prophase
b) Metaphase
c) Anaphase
d) Telophase

14. D. Cytokinesis: division of the cytoplasm
a) Animal cells: the plasma membrane pinches in until two separate cells are formed
b) Plant cells: a cell plate forms between the two nuclei separating the daughter cells

15. Cytokinesis in Animal Cells

16. Cytokinesis in Plant Cells