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Comparative polytene chromosome maps of D. montana and D. virilis

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Abstract

Chromosomal inversion polymorphism was characterized in Finnish Drosophila montana populations. A total of 14 polymorphic inversions were observed in Finnish D. montana of which nine had not been described before. The number of polymorphic inversions in each chromosome was not significantly different from that expected, assuming equal chance of occurrence in the euchromatic genome. There was, however, no correlation between the number of polymorphic inversions and that of fixed inversions in each chromosome. Therefore, a simple neutral model does not explain the evolutionary dynamics of inversions. Furthermore, in contrast to results obtained by others, no significant correlation was found between the two transposable elements (TEs) Penelope and Ulysses and inversion breakpoints in D. montana. This result suggests that these TEs were not involved in the creation of the polymorphic inversions seen in D. montana. A comparative analysis of D. montana and Drosophila virilis polytene chromosomes 4 and 5 was performed with D. virilis bacteriophage P1 clones, thus completing the comparative studies of the two species.

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Acknowledgements

This project was funded by the European Commission as part of a Research Training Network (HPRN-CT-2002-00266). Special thanks also to Oulanka Biological Station and LAPBIAT project for funding the collection of biological material. The authors, Ramiro Morales-Hojas and Seliina Päällysaho, contributed equally to this work.

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Authors and Affiliations

  1. Instituto de Biologia Molecular e Celular (IBMC), University of Porto, Rua do Campo Alegre 823, Porto, 4150-180, Portugal

    Ramiro Morales-Hojas, Cristina P. Vieira & Jorge Vieira

  2. Department of Biological and Environmental Sciences, University of Jyvaskyla, P.O. Box 35, 40014, Jyvaskyla, Finland

    Seliina Päällysaho & Anneli Hoikkala

Authors
  1. Ramiro Morales-Hojas
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  2. Seliina Päällysaho
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  3. Cristina P. Vieira
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  4. Anneli Hoikkala
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  5. Jorge Vieira
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Correspondence to Ramiro Morales-Hojas.

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Communicated by S. Henikoff

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Morales-Hojas, R., Päällysaho, S., Vieira, C.P. et al. Comparative polytene chromosome maps of D. montana and D. virilis . Chromosoma 116, 21–27 (2007). https://doi.org/10.1007/s00412-006-0075-3

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  • DOI: https://doi.org/10.1007/s00412-006-0075-3

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