title: Gene action in fish of tetraploid origin. III. Ribosomal DNA amount in cyprinid fish.
abstract: Phylogenetically diploid and tetraploid cyprinid fish species have cells of very similar volumes and protein contents. This finding has prompted us to postulate a regulatory system established during the evolution of the tetraploids leading to a diploid state of genic expression. It was proposed that this might be accounted for by a selective loss of ribosomal genes. RNA-DNA hybridization experiments, however, reveal a clear-cut 1:2 relationship of ribosomal DNA amounts between the diploid and the tetraploid species.
mesh_terms: D000818:Animals; D003530:Cyprinidae / Q000378:metabolism*; D004247:DNA / Q000378:metabolism*; D004171:Diploidy; D006367:HeLa Cells / Q000378:metabolism; D007700:Kinetics; D009693:Nucleic Acid Hybridization; D011123:Polyploidy; D012335:RNA, Ribosomal / Q000378:metabolism; D012270:Ribosomes / Q000378:metabolism*; D013045:Species Specificity
chemical_list: D012335:RNA, Ribosomal; D004247:DNA