Chapter 12: The Cell Cycle

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Presentation transcript:

Chapter 12: The Cell Cycle AP Biology Mrs. Ramon

The Life of a Cell

Chromosome Duplication

Cytokinesis in animal and plant cells

Prokaryotic Cell Division

Control of Cell Division Physical factors that stimulate or inhibit cell division Growth factors Density-dependent inhibition

Control of Cell Division Checkpoints G1 (restriction pt.) Ready to begin? Failure to pass this checkpoint causes the cell to enter G0 G2 Ready to divide? M Is cell division complete?

Cell Cycle Control

Cancer Cancer cells divide excessively and invade other tissues “Immortal” Example: HeLa Cells (1951) Mutations in specific genes cause cells to become cancerous Oncogenes Gas pedal for cell growth Mutation  gas pedal is stuck down Tumor suppressors Brakes for cell division Mutation  brakes don’t work