[The mutability of natural populations and laboratory strains of Drosophila under conditions of chronic irradiation at small doses of low intensity].

The frequency of irradiation-induced recessive lethals has been studied in chromosomes 1 and 2 of Drosophila melanogaster. It supposed, that the higher level of mutability may be explained in destabilization of genotype. The essential part in induction of genotype destabilization replies the genome instability mechanisms.