THE FEATURES OF THE POLYTENE CHROMOSOME A TTACHMENT TO THE NUCLEAR-ENVELOPE OF OVARIAN PSEUDONURSE CELLS IN DROSOPHILA-MELANOGASTER

Certain aspects of the polytene chromosome attachment to the nuclear e nvelope (NE) of ovarian pseudonurse cells (PNC) in the mutant strains otu(II) and fs(2)B of Drosophila melanogaster were studied. In contras t to salivary a local chromocenter and Rable-orientation of chromosome s were shown to be missing from the PNC nuclei. The pericentric region s were scattered in the nuclear space and were obliged to attach to th e NE by specific loci of heterochromatin. These loci were assigned to the regions 20CD and 41, and the proximal regions 81 and 101 of the cy tological map of secondary polytene chromosomes. Each of the loci, whi ch was obliged to attach to the NE, had a specific morphology that was similar in the otu(II) and fs(2)B strains. PNC were shown to resemble normal ovarian nurse cells of D. melanogaster in the position of the polytene chromosomes and their attachment to the NE.