title: Karyotype and chromosome banding in the reed frog Hyperolius viridiflavus ommatostictus (Amphibia, Anura, Hyperoliidae).
abstract: C-banding and mithramycin staining were used to characterize the karyotypes of 10 specimens of the African reed frog Hyperolius viridiflavus ommatostictus from Tanzania. The diploid chromosome number is 2n = 24. Although no heteromorphic sex chromosomes were present in the mitotic karyotypes, in many diakineses of male meiosis one or two bivalents exhibited an end-to-end arrangement. In the laboratory 7 out of 24 females changed sex spontaneously. This indicates that an XY/XX system of sex determination operates in H. viridiflavus ommatostictus.
authors.affiliation: Institut für Humangenetik, Würzburg, Federal Republic of Germany.
authors.forename: C G
authors.initials: CG
authors.lastname: de Almeida
authors.forename: T U
authors.initials: TU
authors.lastname: Grafe
authors.forename: M
authors.initials: M
authors.lastname: Guttenbach
authors.forename: M
authors.initials: M
authors.lastname: Schmid
mesh_terms: D000818:Animals; D001001:Anura / Q000235:genetics*; D002871:Chromosome Banding; D005260:Female; D006570:Heterochromatin; D007621:Karyotyping; D008297:Male; D009697:Nucleolus Organizer Region; D012730:Sex Chromosomes; D012732:Sex Determination Analysis
chemical_list: D006570:Heterochromatin