Localization of the ribosomal RNA genes in Drosophila simulans.
In situ hybridization of cloned rRNA genes from Drosophila melanogaster to D. simulans metaphase chromosomes shows that in the tested wild type strains both sex chromosomes contain a nucleolus organizer region. Silver grain counts support the published data that the X chromosomal rRNA gene number is significantly higher than the Y chromosomal.
D000818:Animals; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D004330:Drosophila / Q000235:genetics*; D004331:Drosophila melanogaster / Q000235:genetics; D005260:Female; D005796:Genes; D008297:Male; D009693:Nucleic Acid Hybridization; D009697:Nucleolus Organizer Region; D014176:Protein Biosynthesis; D012335:RNA, Ribosomal / Q000235:genetics*; D012730:Sex Chromosomes / Q000648:ultrastructure*; D012737:Sex Factors
D012335:RNA, Ribosomal; D004247:DNA