Which statement best reflects the relationship between fractionation and genetic mutational damage according to animal data?

• A. Fractionation reduces mutational damage
• B. Fractionation increases mutational damage
• C. Fractionation has no effect on mutational damage
• D. Fractionation eliminates mutational damage

Answer: (B)

Spreading a radiation dose into multiple fractions changes how DNA damage in germ cells is fixed and transmitted to offspring. In animal studies, delivering the same total dose as several smaller fractions tends to yield more heritable genetic changes than one large dose. Each fraction can introduce DNA lesions, and if germ cells are actively dividing, some mutations may not be fully repaired before the next exposure or may be fixed in subsequent cell cycles, increasing the chance that a mutation is carried forward. Because of these dynamics, the observed rate of mutational damage in offspring can be higher with fractionated dosing. This is why animal data support the idea that fractionation increases mutational damage.