Control of Cell Cycle and Cancer Notes

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• Control of Cell Cycle and Cancer Notes

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What factors initiate and control cell division?
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Normal Control of the Cell Cycle

• Enzymes work to monitor a cells progress from
  phase to phase during the cell cycle
• Some enzymes work to replicate DNA, some begin
  cell division, and others control the rest of the
  cell cycle

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Each chromosome contains thousands of genes
genes
genes
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Cancer A Mistake in the Cell Cycle

• Cancer is the result of uncontrolled cell
  division caused by genetic and environmental
  factors
• Uncontrolled cell division occurs when
• Cells fail to produce certain enzymes
• Enzymes are overproduced
• Enzymes are produced at the wrong time

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Stages of Cancer

• Cancerous cells result from a change in one or
  more genes
• Form masses of tissues called tumors that deprive
  normal cells of nutrients
• Later cancer can enter the circulatory system and
  spread throughout the body