Investigations on radiosensitive and radioresistant populations of Drosophila melanogaster. II. Restriction of the decrease in radiosensitivity of the irradiated population RO I to stage-7 oocytes

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An irradiated (RÖ I) and a contemporaneous control (+60) population (both of which originally were derived from the Berlin wild stock of Drosophila melanogaster) were tested for possible differences in radiosensitivity. Prior to the commencement of the present studies, the irradiated population had been exposed to 2100 R of X-rays each generation for over 220 generations in an experimental design which involved the sampling of oocytestages 6–14, mature spermatozoa and spermatids in each generation.