The Cell Cycle.

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Presentation transcript:

The Cell Cycle

Stages of the Cell Cycle First Growth (G1) Phase Synthesis (S) Phase Second Growth (G2) Phase Mitosis (M) Cytokinesis (C)

The Cell Cycle: Interphase A cell spends (90%) of its time in Interphase First Growth (G1) Phase: cell grows rapidly and carries out its routine functions. Cells that are not dividing remain in the G1 phase. Synthesis (S) Phase: cell’s DNA is copied. Second Growth (G2 )Phase: preparations are made for the nucleus to divide.

process during cell division in which the cytoplasm divides. Final Stages Mitosis: process during cell division in which the nucleus of a cell is divided into two nuclei. Cytokinesis: process during cell division in which the cytoplasm divides.

Importance of Mitosis and Cytokinesis Mitosis and Cytokinesis produce new cells that are identical to the original cells and allow organisms to grow, replace damaged tissues, and, in some organisms, reproduce asexually.

How do cells know when to divide? How is the cell cycle controlled?

Check Points Checkpoints control the phases of the cell cycle and send feedback signals to trigger the next phase of the cell cycle. Three important checkpoints : end of G1 phase, end of G2 phase, and halfway through mitosis.

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