"Sex ratio" in Drosophila pseudoobscura: spermiogenic failure.
Contrary to earlier reports, testes of "sex ratio" Drosophila pseudoobscura males have only half as many sperm per bundle as testes of normal males do. This fact, determined from electron micrographs, indicates that the functional pole hypothesis is not applicable to the action of "sex ratio."
D000818:Animals; D004330:Drosophila; D008297:Male; D008854:Microscopy, Electron; D012730:Sex Chromosomes; D012744:Sex Ratio; D013094:Spermatozoa; D013737:Testis / Q000166:cytology*