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Tumor suppressor genes normally function to inhibit cell survival or cell proliferation, whereas proto-oncogenes promote cell survival or cell proliferation.

Please choose the BEST answer from the dropdown prompts below.

Mutant forms of tumor-suppressor genes act
Select Option recessivelydominantly
, meaning that
Select Option both copies are mutatedone copy is mutated
before their protective function is lost; in contrast oncogenes act
Select Option recessivelydominantly
. This means that a gene therapy-based treatment for certain types of cancers would work best for mutations within
Select Option tumor-suppressor genesproto-oncogenes
.
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