[The dynamics of variability of the genotype of experimental populations of Drosophila melanogaster by chronic radiation exposure].

The reaction on the irradiation in a dose 3 Gy of experimental populations of Drosophila melanogaster, differing on mobile genetic element patterns, chronically irradiated in low doses ionising radiation was investigated. Received results testify that the effect of radioadaptation is found out only in populations with an initial genotype and is not revealed at populations containing P-mobile elements. It is shown, that in chronically irradiated populations D. melanogaster with an initial genotype, decrease in frequency recessive lethal mutations after a sharp irradiation in a dose 3 Gy is observed. The analysis of frequency of dominant lethal mutations and gonads atrophy such tendency has not revealed. It is supposed, that the mechanisms participating in formation of the adaptive answer, induced with an irradiation and transpositions activity of mobile elements differ.