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Chromosomes, DNA sequences, and evolution in salamanders of the genus Plethodon

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Abstract

Chromosomes and DNA sequence homologies have been studied in 15 species of North American salamander belonging to the genus Plethodon. These include 4 Eastern small species, 5 Eastern large species, 5 Western, and 1 New Mexican species. All species have 14 metacentric or sub-metacentric chromosomes. Their karyotypes are closely similar, but their C values range from 18–69 pg. DNA:DNA molecular hybridization studies showed that salamanders belonging to the same species group had between 60 and 90% of the observed repetitive DNA sequences in common, different groups of Eastern species had between 40 and 60% in common, and Eastern and Western groups had less than 10% in common. The slowly reassociating DNA sequences were also diverse among species, but higher levels of homology were observed than in the case of repetitive sequences. The New Mexican species was exceptional in showing little homology with other species with respect to either repetitive or slowly reassociating sequences.

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  1. Department of Zoology, School of Biological Sciences, University of Leicester, England

    Shigeki Mizuno & Herbert C. Macgregor

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  1. Shigeki Mizuno
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  2. Herbert C. Macgregor
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Mizuno, S., Macgregor, H.C. Chromosomes, DNA sequences, and evolution in salamanders of the genus Plethodon . Chromosoma 48, 239–296 (1974). https://doi.org/10.1007/BF00326507

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  • DOI: https://doi.org/10.1007/BF00326507

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