Abstract
Data are presented on the sex-linked mutation rate in mature sperm of Drosophila melanogaster at 7 dosage levels of cobalt-60 gamma-radiation in the 300 r to 12.5 kr range. Lethal chromosomes from the lowest and highest doses were analyzed genetically, and the results are compatible with the interpretation that a Poisson-like accumulation of lethal mutations occurred throughout this dosage range, with an average increase of 2% lethal mutations per kr.

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