title: The number and location of genes for 5S ribonucleic acid within the genome of Drosophila melanogaster.
abstract: DNA was prepared from wild-type and two mutant stocks of Drosophila melanogaster that differed in their dosage of the nucleolar organizer region. The relative amounts of DNA from the nucleolar organizer region in these preparations of DNA were determined by hybridization with (3)H-labelled 28S rRNA. As expected, the amount of (3)H-labelled 28S rRNA that hybridized was directly related to the dosage of nucleolar organizer region. No positive correlation was observed between the amount of (3)H-labelled 5S RNA that hybridized and the dosage of nucleolar organizer region. Thus genes for 5S RNA are located primarily, if not exclusively, outside the nucleolar organizer region. The haploid genome of the wild-type D. melanogaster used in this work has 106 genes for 28S rRNA and 96-105 genes for 5S RNA.
mesh_terms: D000818:Animals; D002466:Cell Nucleolus / Q000032:analysis; D002499:Centrifugation, Density Gradient; D002845:Chromatography; D002874:Chromosome Mapping; D004247:DNA; D004330:Drosophila; D005796:Genes; D006238:Haploidy; D009154:Mutation; D009693:Nucleic Acid Hybridization; D012313:RNA; D012335:RNA, Ribosomal; D014316:Tritium
chemical_list: D012335:RNA, Ribosomal; D014316:Tritium; D012313:RNA; D004247:DNA