An enhancement of the yield of X-ray-induced Minute mutations in the c3G female-ywmf-2 male system of Drosophila melanogaster.
The possible enhancement of the yield of X-ray-induced Minute mutations in the c3G female-ywmf-2 male system which is proposed to be responsible for the high production of spontaneous Minute mutations was investigated. To determine and compare the yield of X-ray-induced Minute mutations exactly, four series of crosses were made: (a) ywmf-2 male x Oregon-R (OrR) female crosses, spontaneous Minute mutations were scored; (b) ywmf-2 male x c3G female crosses, spontaneous Minute mutations produced in the c3G female-ywmf-2 male system were evaluated; (c) X-irradiated ywmf-2 male x OrR female crosses, the yield of Minutes induced by X-rays in the different stages of male germ cells was evaluated; and (d) X-irradiated ywmf-2 male x c3G female crosses, the yield of X-ray-induced Minutes in the c3G female-ywmf-2 male system was evaluated. The results show that the yield of X-ray-induced Minutes recorded in the c3G female-ywmf-2 male system is 2.37-16.55 times more than that in the ywmf-2 male x OrR female crosses. This finding clearly indicates that the yield of these mutations is greatly enhanced in the c3G female-ywmf-2 male system. This possibly suggests that the c3G female-ywmf-2 male system may be responsible not only for the high production of spontaneous Minute mutations but also for the high formation of radiation-induced Minutes.
Miyamoto
T
T
Laboratory of Natural Sciences, Takamatsu Junior College, Japan.
D000818:Animals; D003433:Crosses, Genetic; D004331:Drosophila melanogaster / Q000235:genetics*; D005260:Female; D017353:Gene Deletion; D005799:Genes, Dominant / Q000528:radiation effects*; D008297:Male; D009630:Nondisjunction, Genetic; D012343:RNA, Transfer / Q000235:genetics; D011995:Recombination, Genetic; D012727:Sex Characteristics
D012343:RNA, Transfer