1. Cell Division: The Cell Cycle & Mitosis

2. The Cell Cycle

3. The Cell Cycle
The cell cycle describes the regular sequence of growth and division that cells undergo.

4. Animated Cell Cycle

5. Mitosis
The process in which the nucleus divides. One copy of the DNA is distributed into 2 daughter cells.
The daughter cells are identical to one another and to
the original parent cell.

6. Stages: Interphase (1st stage of the cell cycle) Prophase (mitosis)
Metaphase (mitosis)
Anaphase (mitosis)
Telophase (mitosis) & Cytokinesis (last stage of the cell cycle)
Remember the stages of Mitosis with “PMAT”

7. Interphase The cell prepares for division:
DNA replicated
Organelles replicated
Cell increases in size

8. Interphase Plant Cell Animal Cell
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9. Prophase The cell prepares for nuclear division:
Packages DNA into chromosomes

10. Prophase Plant Cell Animal Cell
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11. Metaphase The cell prepares chromosomes for division:
Chromosomes line up at the center of the cell
Spindle fibers attach from daughter cells to chromosomes at the centromere

12. Metaphase Plant Cell Animal Cell
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13. Anaphase The chromosomes divide:
Spindle fibers pull chromosomes apart
½ of each chromosome (called chromotid) moves to each daughter cell

14. Anaphase Plant Cell Animal Cell
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15. Telophase & Cytokinesis
The cytoplasm divides:
DNA spreads out
2 nuclei form
Cell membrane pinches
in to form the 2 new daughter cells.

16. Telophase Plant Cell Animal Cell
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17. Mitosis Animation:

18. Animal Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase                                                             

19. Plant Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase                                                             

20. The Cell Cycle vs. Mitosis
The cell cycle describes the regular sequence of growth and division that cells undergo.
The cell cycle consists of: Interphase +
Mitosis
Cytokinesis
Mitosis is the stage of the cell cycle during which the cell’s nucleus divides.
The nucleus divides during several stages, which include:
-Prophase
-Metaphase
-Anaphase
-Telophase

21. The Cell Cycle Timeline:
95% of cell cycle is spent in interphase
5% in mitosis

22. Some Other Definitions:
Somatic Cells – body cells
Produced through mitosis
Has 46 chromosomes (23 pairs)
Diploid (2n) – total of 46 chromosomes in people – zygote & somatic cells
Haploid (n) – total of 23 chromosomes in people, gametes (sperm & egg)

23. Mitosis vs. Meiosis
Mitosis occurs in diploid cells, which means cells that have 23 pairs of chromosomes (46 chromosomes total). This is almost all of your cells.
Meiosis occurs in haploid cells, which means cells that only have ½ of the chromosomes needed. Meiosis only occurs in sex cells.
(gametes=egg and sperm.)