The cell cycle has four main stages.

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Presentation transcript:

KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions.

The cell cycle has four main stages. The cell cycle is a regular pattern of growth, DNA replication, and cell division.

1. Gap 1 (G1): cell growth and carry out normal functions Main stages of the cell cycle: Gap 1 Synthesis Gap 2 Mitosis 1. Gap 1 (G1): cell growth and carry out normal functions Organelles replicated

3. DNA synthesis (S): copies DNA Main stages of the cell cycle: Gap 1 Synthesis Gap 2 Mitosis 3. DNA synthesis (S): copies DNA

5. Gap 2 (G2): additional growth Main stages of the cell cycle: Gap 1 Synthesis Gap 2 Mitosis 5. Gap 2 (G2): additional growth

7. Mitosis (M): cell division and division of cytoplasm (cytokinesis) Main stages of the cell cycle: Gap 1 Synthesis Gap 2 Mitosis 7. Mitosis (M): cell division and division of cytoplasm (cytokinesis)

9. Prophase 10. Metaphase 11. Anaphase 12. Telophase 13. Cytokinesis Phases of Mitosis 9. Prophase 10. Metaphase 11. Anaphase 12. Telophase 13. Cytokinesis

Cells divide at different rates. The rate of cell division varies with the need for those types of cells.

Cell is too small- could not hold all organelles Cell size is limited. Cell is too small- could not hold all organelles Cell is too big-could not move enough material through cell membrane Perfect size = cell growth and division occur

Surface area must allow for adequate exchange of materials. Cell growth is coordinated with division. Cells that must be large have unique shapes.