It was set as a result of the conducted researches, that in the conditions of physiological postnatal ontogenesis of its different stages the differences in the RNA activity come to light. The highest RNA activity is found in newborn rats, after that it sharply decreases in 2-week rats and a new rise in activity takes place at one-month animals. A reliable increase in the RNA activity with subsequent inhibition on all stages of ontogenesis as compared to the same age control takes place in ontogenesis of F1 generation of irradiated males and females in 2-day rats.
