Now-a-days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its complimentary DNA in a clone of cells, followed by its detection using autoradiography because:
mutated gene does not appear on photographic film as the probe has complementarity with it
mutated gene partially appears on a photographic film
mutated gene completely and clearly appears on a photographic film
mutated gene does not appear on a photographic film as the probe has no complementarity with it
