Summary
C-banding and mithramycin staining were used to characterize the karyotypes of 10 specimens of the African reed frogHyperolius 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 inH. viridiflavus ommatostictus.
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This study was supported by the Deutsche Forschungsgemeinschaft (Schm 484/2-4). We thank K. E. Linsenmair and C. M. Richards for helpful comments on an earlier draft.
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de Almeida, C.G., Grafe, T.U., Guttenbach, M. et al. Karyotype and chromosome banding in the reed frogHyperolius viridiflavus ommatostictus (Amphibia, Anura, Hyperoliidae). Experientia 46, 509–511 (1990). https://doi.org/10.1007/BF01954249
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DOI: https://doi.org/10.1007/BF01954249