X-ray-induced reversion of thewhite-ivory mutant ofDrosophila melanogaster

Following X irradiation,wⁱ reverts in oogonia and in spermatogonia. following treatment of adult females,wⁱ reverts equally frequently in homozygotes and deficiency heterozygotes. Induced reversions are commonly recovered as clusters, indicating that they are of gonial origin. In contrast towⁱ, two partial reversions recombine normally withw^ch. One of these has been tested for X-ray-induced reversion and found to be stable.A part of this investigation began while the senior author was a predoctoral trainee under Public Health Training Grant GM 701.05 at the University of California, Davis. It was completed under Utah State University Research Council Grant U-302.