Abstract
The dynamics of hybrid dysgenesis frequency in F 1 descendants of two lines of Drosophila melanogaster (lines Santon-s and radius incompletus (ri) brining P-mobile element), which was maintained for 20 generations were under the conditions of chronic radiation with three dose rate (1.2 × 10−8; 0.3 × 10−8; 0.12 × 10−8 Gy/s), have been studied. Gradual changes have been shown in the dose dependences of the hybrid dysgenesis frequency for F 1 descendants of every 20 generations from parents exposed to radiation. The complicated dynamics of the transitional process of the appearance of gonadal dysgenesis depending on the duration and dose rate of irradiation in ancestors, has been found. The cumulative effect of the prolonged irradiation appears in the form of adaptation at the lowest dose rate of irradiation and at exhaustion at the highest used dose rate. Problem of the transitional process peculiarities, including the hierarchy of protective and adaptive reactions under the conditions of the chronic irradiation has been discussed.
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