1. Cell Growth and Reproduction Ch. 8.2
Mitosis & Cytokinesis
Cell Growth and Reproduction Ch. 8.2

2. Why do cells divide by Mitosis?
Growth &Repair
Reproduction of single celled organisms under? conditions
constant environment
Amobea
Reproducing

3. Cells dividing by Mitosis…….
Skin
Identical to original cell
Same chromosome #
Identical chromosome makeup

4. Cell Cycle “G” or Growth 1 phase “S” or DNA Synthesis 24 hours
“M” or
Mitosis
phase /
Growth 2

5. Where is DNA located?
1. Nucleus
2. Chromosomes
DNA I

6. Duplicated Chromosome (Late Interphase):X
Sister
Chromatids
Centromere

7. Spindle & spindle fibers: Pull apart the sister chromatids

8. Cytokinesis:cell’s cytoplasm divides & splits apart

9. Stages of Mitotic Cell Division
Prophase
Metaphase
Anaphase
Telophase
“1st”
“middle”
“apart”
“far” or separate

10. Interphase “Intermission” Normal metabolic activities Major state DNA=
chromatin

11. Late Interphase Prepares for mitosis DNA doubles= Sister chromatids
Centrioles double in
animals X X X X X X

12. Prophase Nuclear membrane disappears Doubled DNA = condensed
“chromosomes”
Spindle fibers
Prophase

13. Metaphase
Chromosomes line up mid- cell
Facing inward

14. Anaphase Chromosomes move to opposite poles at Centrioles in animals
Spindle apparatus in
plants

15. Telophase
Cells divide
Cell plate or membranes form
Nucleus reappears

16. Returns to Interphase “Intermission” Normal metabolic activities
Major state
DNA=chromatin

17. Plant versus Animal Mitosis
Cell wall from
cell plate in telophase
Sindles
Animal:
No cell wall
membrane cytokinesis
Centrioles

18. Animal Telophase
Interphase

19. Plant Anaphase
Interphase

20. Cancerous cells……... 1.Divide too many times
2.Divide into more than two cells!
Masses of cells =
“tumors”
benign
malignant