title: [Viability at different stages of development and early embryogenesis of Drosophila virilis and D. littoralis and their hybrids].
abstract: The low percentage of larval hatching both in the initial lines and the hybrids of direct and back crosses was shown to be due to the low fertilizability of eggs. A study of early embryogenesis, up to the gastrulation, has shown that the F1 hybrids (female D. virilis x male D. littoralis) develop at a lesser rate than both the parental species. Some embryos of these latter attain the stage of blastoderm syncytium for 2 hrs whereas the hybrid embryos attain only the stage of polynuclear syncytium.
mesh_terms: D000818:Animals; D004330:Drosophila / Q000254:growth & development*; D005306:Fertilization; D006824:Hybridization, Genetic; D008675:Metamorphosis, Biological; D009026:Mortality
vernacular_title: Vyzhivaemost' na raznykh stadiiakh razvitiia i ranniĭ émbriogenez Drosophila virilis i D. littoralis i ikh gibridov