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The origin of the brown frogs with 2n=24 chromosomes

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Abstract

Late replication and C-banding analyses of somatic metaphase chromosomes were attempted on three species of brown frogs with 2n=26 chromosomes (Rana japonica, R. tsushimensis andR. temporaria), and three with 2n=24 chromosomes (R. ornativentris, R. dybowskii andR. chensinensis), which are distributed in the Palearctic region. The late replication banding patterns were highly conserved in these species. Four chromosome inversions were demonstrated inR. ornativentris, two inR. dybowskii and two inR. tsushimensis. From a detailed comparison of late replication and C-banding patterns between the 2n=26 and the 2n=24 species, it was found that an end-to-end fusion of two small chromosomes (nos 11 and 13) in an ancestral 2n=26 species may have produced the medium-sized no. 6 chromosome of the 2n=24 species.

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Authors and Affiliations

  1. Laboratory for Amphibian Biology, Faculty of Science, Hiroshima University, 724, Higashihiroshima, Japan

    I. Miura & M. Nishioka

  2. Department of Herpetology, Zoological Institute, Academy of Sciences, 199164, St. Petersburg, Russia

    L. J. Borkin

  3. Institute of Developmental Biology, Academia Sinica, 100080, Beijing, People's Republic of China

    Z. Wu

Authors
  1. I. Miura
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  2. M. Nishioka
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  3. L. J. Borkin
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  4. Z. Wu
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Miura, I., Nishioka, M., Borkin, L.J. et al. The origin of the brown frogs with 2n=24 chromosomes. Experientia 51, 179–188 (1995). https://doi.org/10.1007/BF01929366

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  • DOI: https://doi.org/10.1007/BF01929366

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