Chromosomes E and S in the Oogenesis of the Gall Midge
It has been well documented that the extra chromosomes (L and E) in some insects are characteristic of gamete lines and are eliminated from somatic cells in early embryogenesis (Boswell and Mahowald, 1985). However, the behaviour of these chromosomes in oogenesis, their share in the formation of polar germ plasma which determines the fate of future gametes remains so far obscure. The origin, structural and biochemical organization of these chromosomes are also to be clarified. This paper gives the data on the behaviour of chromosomes S (S-ch) and E (E-ch) during oogenesis, meiotic division and early embryogenesis of the raptorial gall midge Aphidoletes aphidimyza. The cytology and cytogenetics of this species, as well as the whole group of zoophagic gall midges, has not been properly studied (Matuszewski, 1982).
Unable to display preview. Download preview PDF.