1Faculty of Life and Environmental Science, Shimane University, 1060 Nishikawatsu cho, Matsue city, Shimane prefecture 690-8504, Japan
2Faculty of Science, Shimane University, Japan
3Department of Biology, Aichi University of Education, Japan
Tóm tắt
Summry— We detected fully mature undescribed oocytes in Drosophila melanogaster ovaries. The fully mature oocytes were rehydrate in ovaries. In the oocyte of stage 14, chromosomes make globular mass, while the chromosome shows meiotic metaphase I in fully mature oocytes. Both mature oocytes and stage 14 oocytes were activated by hypotonic treatment. When the mature oocytes or the stage 14 oocytes were activated, telophase II figures were observed in former oocytes but meiosis in latter oocyte stopped at late metaphase I, suggesting the stage 14 activated oocyte cannot pass the second checkpoint of meiosis.
