Abstract
SUMMARYOocyte chromosomes in whole-mount preparations of S7–8 egg follicles of M. domestica appear condensed in a karyosome-like structure. At stage 10, oocytes are in the pachytene, and the chromatin looks diffuse, giving it a lampbrush appearance during this period. Individualized bivalents are found after the degeneracy of the nuclear membrane (early stage 13). At the end of stage 13, meiosis is arrested at metaphase I. In the S14 follicle, the chromosomes are again bound together and compacted in a karyosphere-like structure. The mechanic stimulus of the oviposition is sufficient to restore the meiotic process.
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