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Under Normal Circumstances, Several Important Types of Genes Control the Activities

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Under normal circumstances, several important types of genes control the activities of cells. Some of these genes (proto-oncogenes, tumor suppressor genes, and mutator genes) have critical roles in regulating cell growth and division, as well as repair of DNA during replication. Despite their important roles, mutations to any one of these genes alone do not induce a cancerous condition. Explain why.

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Alterations of these genes may increase ...

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