Biology / Unit 4 Bio 0897 short lesson, about 20 seconds
"An Oncogene Is a Foreign, Invading Gene"
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The idea
An oncogene is the cell's own proto-oncogene after mutation, not a gene introduced from outside.
In practice
The RAS oncogene, mutated in many cancer cells, is the mutated form of a RAS gene every healthy cell already carries.
Where people slip
Picturing an oncogene as an invader misplaces the cause — mutation strikes a gene the cell needed all along, not a foreign intruder.
Your place on the trail
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