[Dynamics of gonadal dysgenesis frequency in Drosophila melanogaster under controlled conditions of chronic radiation exposure].

Two Drosophila melanogaster strains (Canton-S and ri-lines) for 20 generations were in the controlled terms of chronic irradiation with 3-dose rate (1,2 x 10(-8); 0,3 x 10(-8); 0,12 x 10(-8) Gy/c). The dynamics of hybrid dysgenesis frequency was explored for each generation of F1 descendants from Canton-S and ri-lines crossing. The gradual change of dose response of hybrid dispense depending on duration of irradiation of ancestors and dose rate was shown. The complex dynamics of hybrid dysgenesis frequency depending on irradiation duration of ancestors and dose rate was detected. The cumulative effect of the prolonged irradiation shows up as adaptation at the lowest dose rate and as exhaustion at the highest dose rate. Question comes into discussion about the features of transitional process and including of protective and adaptive reactions hierarchy at the conditions of radiation factor chronic action.