Hybrid dysgenesis in Drosophila melanogaster: a new type of gonadal dysgenic sterility expressed at the pre-pupal stage.
Two sublines, B-202 and B-207, which were derived from crosses between Or-R (M) females and Cy/Pm (P) males were found to cause a new type of gonadal dysgenic sterility, designated as the GD-3. GD-3 sterility showed a typical reciprocal cross effect under the P-M system. It was caused at the frequency close to 100% in dysgenic offsprings reared above 25 degrees C, of which gonads were morphologically clearly different from those of usual GD sterility, whereas there was no indication of GD-3 sterility at temperatures below 24 degrees C. Temperature sensitive period of GD-3 sterility was estimated to the prepupal stage by shift-down experiment. In the B-202 subline, the 2nd chromosomes marked with Pm alone carried GD-3 elements. Those of the B-207 subline, however, were estimated to locate both on the 2nd and 3rd chromosomes, acting synergistically with each other.
Hihara
F
F
Laboratory of Biology, Faculty of General Education, Ehime University, Japan.
D000818:Animals; D003433:Crosses, Genetic; D004331:Drosophila melanogaster / Q000033:anatomy & histology / Q000235:genetics / Q000254:growth & development*; D005260:Female; D005298:Fertility / Q000235:genetics*; D006066:Gonads; D006824:Hybridization, Genetic; D007700:Kinetics; D008297:Male; D012727:Sex Characteristics; D013696:Temperature