[Comparative study of salivary gland polytene chromosome asynapsis in larvae of Drosophila melanogaster, Drosophila simulans and their hybrids].

Quantitative comparative study of larvae salivary gland chromosome asynapsis has been performed on 3L arm for sibling species of Drosophila melanogaster, D. simulans and their hybrids (D. melanogaster female X D. simulans hermaphrodite). A frequency of asynapsis occurence, an asynapsis localization and distributions of asynapsis terminal points and asynapsis lengths were determined. It is revealed that parent species are very similar as regards to quantitative characteristics studied. For hybrids there are some essential differences with either of parent species. These are: 1) reliably larger frequency of asynapsis, 2) different character of asynapsis localization, and 3) two new "peaks" of distal terminal points of asynapsis and three new "peaks" of proximal terminal points of asynapsis are revealed, main parents "peaks" being kept.