It has been established, that the mobile hobo-elements are the sources of the genetic heterogenicity in the genome of the low-active inbred line NA. A selection by the adaptively important signs brings to the active transposition of the hobo-elements, the variation of the full-dimensional and deleted fraction hobo and directed variation of the disgenic characteristics. With the isogenisation of the chromosomes of the NA line, a high site-specificity of the transposition has been notedAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio