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 :

Options :

1. mutated gene partially appears on a photographic film

2. mutated gene completely and clearly appears on a photographic film.

3. mutated gene does not appear on a photographic film as the probe has no complimentarity with it.

4. mutated gene does not appear on photographic film as the probe has complimentarity with it.