1. Cell Reproduction and Growth Chapter 10
Cell Division M C

2. Limits on Cell Size Diffusion is more efficient over short distances
DNA limitations (has to be able to make proteins for whole cell)
Surface area – to – volume ratio

3. Cell Reproduction
1 somatic cell (parent cell) reproduces to make 2 identical somatic cells (daughter cells)…

4. (phases in the life cycle of a cell)
The Cell Cycle
(phases in the life cycle of a cell)
Interphase (G1, S, G2)
Cell Division-
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis

5. What happens in each of these phases of the cell cycle?

6. Interphase
Cell grows in size and metabolizes
Chromosomes duplicated

7. G1-growth phase 1
S-synthesis
G2-growth phase 2

8. 1. Prophase Chromatin coils up into chromosomes Nucleus disappears
(Chromosomes are made up of 2 sister chromatids attached by a centromere)
Nucleus disappears
Centrioles move to poles
Spindle forms

9. 2. Metaphase
Chromosomes attach to the spindle and line up on the equator of the cell.
Spindle fibers attach to each sister chromatid at the centromere.

10. 3. Anaphase
Sister chromatids separate and move to opposite poles as spindle fibers shorten

11. 4. Telophase Chromatids reach poles Chromosomes unwind Nuclei reform
Spindle fibers break down

12. 5. Cytokinesis
Division of the cytoplasm…separation of the 2 new cells

13. Cytokinesis: Animal vs. Plant
Plasma membrane pinches in (cleavage furrow)
Cell is pinched in two
Cell plate laid down along equator
Plasma membrane forms around each cell
New cell walls form on each side of cell plate

14. Summary
Mitosis

20. Check your BRAIN!
Describe how a cell’s surface area-to-volume ratio limits its size.
2. Why is it necessary for a cell’s chromosomes to be distributed to its daughter cells in such a precise manner?
3. How is the division of cytoplasm different in plants and in animals?
4. List the 4 phases of mitosis.

21. Key Terms Chromosomes Chromatin Sister chromatids Centromere
Spindle (spindle fibers)
Centrioles
Cleavage furrow
Cell plate
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis