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Lampbrush chromosomes in the meroistic ovaries of the blowfly Calliphora erythrocephala.

A period of unfolded prophase I chromosomes in females with meroistic ovaries may be a rather universal phenomenon. Earlier investigations on lampbrush chromosomes in oocytes of Drosophila have now been followed up in Calliphora erythrocephala females. RNA-producing lampbrush chromosomes are formed during the intervening period between the zygo-pachytene bouquet and the formation of the karyosome in late pachytene. Active nucleoli are developed on several bivalents during this time.