Download - Cell Cycle Power Point
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The Cell Cycle
Biology 1 CP
(Spring ’08)
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The Cell Cycle describes the life of a eukaryotic cell they have a nucleus
Life of a eukaryotic cell is shown in a cycle.
Cell Cycle a repeating sequence of cellular growth and division.
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Stages of the Cell Cycle
Consists of 5 stages Three of the stages together are called
Interphase.These include G1, , S, & G2
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Interphase
1. G1 (First growth phase)Cell grows rapidlyOccupies major portion of the cell’s life
2. S (Synthesis phase)DNA is copiedEach chromosome consists of two chromatids
attached at the centromere.
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3. G2 (Second Growth Phase)Preparations are made for the nucleus to
divide.Microtubules are assembled(hollow protein fibers -- move chromosomes
during mitosis)
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The other 2 phases
4. Mitosis – the process during cell division in which the nucleus of a cell is divided into two nuclei.
(Makes an identical copy of another cell)
5. Cytokinesis – “…” in which the cytoplasm divides.
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How do cells know when to divide?
Cells have “Checkpoints”“red light, green light”
1. Cell growth checkpoint (G1): If conditions are good, moves on to S phase If conditions are not favorable, the cell cycle
will stop.
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2. DNA Synthesis (G2) checkpointDNA replication checked by repair enzymes If passed, the proteins help trigger mitosis.
3. Mitosis checkpoint
- If passed, then moves on to G1 phase.