The influence of the nucleolar organizer region on sperm utilization in Drosophila melanogaster.
D000818:Animals; D002466:Cell Nucleolus; D004331:Drosophila melanogaster / Q000166:cytology*; D005260:Female; D005838:Genotype; D008297:Male; D012730:Sex Chromosomes; D013094:Spermatozoa; D013997:Time Factors