Dynamics of orientation of chromosomes in nucleus ovarian nurse cells in species subgroup D. melanogaster and species group D. virilis
The principles of three dimensional organizations of primary and secondary orders polytene chromosomes in ovarian nurse cells of Drosophila melanogaster were elucidated. The architecture of chromosomes discovered in ovarian nurse cells is tissue-specific and differs considerably from the organization of polytene chromosomes of somatic tissues. The essential differences in the architecture of polytene chromosomes in ovarian nurse cells between species subgroup D. melanogaster, and also between species group D. virilis. Detected alterations in chromosomes architecture confirm evolutionary trends previously revealed in species subgroup D. melanogaster, and also between species group D. virilis.