Development of A New Genetic Method of Improving the Mulberry Silkworm Bombyx Mori L. Breed Balanced on Embryonic Z-Lethal

The problem of artificial control of sex has become important for the genetics and selection of many beneficial animals, which has not lost its relevance even in the current period. This article reveals the results of research on the improvement of the unique C-8ngl breed of Bombyx Mori L. mulberry silkworm balanced on embryonic Z-lethal and sex-limited in the egg stage with a simple genetic system of high-tech with fine silk features. In the experiment, sex-limited C-8ngl breed of Bombyx mori L. mulberry silkworm in the egg stage and balanced on embryonic Z-lethal, also sex-limited trw2w2 × L-67 line, as well as non-sex-limited simple L-28 line, were used. In the second stage of improvement, an analyzer crossing was performed using translocation lines sex-limited in the egg stage to obtain information on which of the double lethal was present in the obtained F1, F2, F3 аnd F4 generation genotype. Genetic schemes have been developed to monitor ℓ1 and ℓ2 embryonic lethal attached to the Z chromosome in F1, F2, F3 аnd F4 generations obtained by backcrossing and to show the extent to which they are present in each generation