Abstract
The synaptic stages of meiosis in Drosophila melanogaster females are very resistant to the induction of dominant lethal mutations by ionizing radiation. It is assumed that dominant lethals result from interstitial chromatid deletions, and that almost all potential chromatid breaks are repaired in synaptic cells. The type of dose response curve shown by oocytes at later developmental stages is a function of the degree of chromatid coiling and the presence or absence of an investing nuclear envelope.
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