What does the data suggest about the dose-dependence of genetic mutational damage?

• A. It is dose-dependent
• B. It is not dose-dependent
• C. It depends on exposure duration but not dose
• D. It is independent of dose

Answer: (A)

Genetic mutational damage from ionizing radiation increases with the amount of energy deposited, showing a clear dose-response relationship. As the dose goes up, the probability of DNA lesions occurring in germ cells rises, and the chance that these lesions are misrepaired into heritable mutations increases accordingly. This pattern—more dose, more mutations—fits the idea that the effect scales with dose across observed data, rather than remaining constant or depending only on how long exposure lasts. If the data showed no change with dose or only a change with exposure duration, that would point to the other possibilities, but the usual findings support a dose-dependent effect.