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Using the DNA-specific dye BAO [2,5-bis-(4′-aminophenyl-(1′)]-1,3,4-oxadiazol), we have examined spermiogenesis in wild-type males of Drosophila melanogaster and in males carrying various combinations of the Sd and Rsp mutations involved in segregation distortion. Wild-type strains, even those newly collected from nature, are heterogeneous with respect to the incidence of spermiogenic abnormalities, principally in having a variable number of spermatid nuclei per cyst that fail to undergo complete elongation. Among segregation distorter males, Rsp/Rsp homozygotes have the greatest incidence of nuclear nonelongation or incomplete elongation, Rsp/Rsp  + heterozygotes are intermediate, while Rsp  +/Rsp  + homozygotes have the least amount of abnormality. Indeed, Sd Rsp  +/Sd  +  Rsp  + males have significantly fewer spermiogenic aberrations than do wild-type strains.

DNA DISTRIBUTION IN SPERMATID NUCLEI OF NORMAL AND SEGREGATION DISTORTER MALES OF DROSOPHILA MELANOGASTER