Cell Cycle.

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Presentation transcript:

Cell Cycle

All cells reproduce by division “Binary Fission” in Prokaryotes

The cell cycle Major stages of a eukaryotic cell’s life cycle. How eukaryotic cells accomplish the processes of growth, repair, and reproduction.

The cell cycle Interphase: non-dividing life (most of the cell cycle). G1→S→G2 M-phase: cell division.

The behavior of chromosomes during the cell cycle allows for heritability

Mitosis Produces two genetically identical “daughter” cells. Chromosomes duplicated in S phase condense, align, and separate.

Cell Cycle Control

Control of Cell Division Mitosis is under strict cellular control. Cells must pass through a series of “checkpoints” to be allowed to divide. If internal conditions are not appropriate, cell division will normally be prevented. Cancer: Uncontrolled cell division.

Internal control of division Cells control cell division by controlling the presence or absence of proteins that allow for cell division. Ex. Mitosis Promotion Factor

External Control of Division Progression through the cell cycle can be triggered by external signals. Ex. Platelet Derived Growth Factor

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