Abstract
SummaryTo study the differential radiosensitivity of male germ-cells and whether this is due to different metabolic conditions of the flies, 24-hour and 48-hour-old pupae of Drosophila melanogaster were irradiated with 220 kv x-rays with a dose of 600 r at 0°c and 25°c. Soon after emergence each male was mated to three M-5 virgin females, then transferred into a new vial with three virgin females every day for ten days, to permit study of the radiation damage induced in germ-cells irradiated at different periods of gametogenesis.The number of progeny of these matings and the recessive sex-linked lethal mutations were scored. A lower number of progeny was found in the broods of the experiments at 0°c than at 25°c. No difference was observed in the mutation frequency induced by the treatments of 24- and 48-hour old pupae. With low temperature no difference appeared in the sensitivity pattern of pupae of different age.No evidence was found that different physiological conditions of pupae at different age may...
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