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DNA synthesis in the neo-X neo-Y sex determination system of Dichroplus bergi (Orthoptera: Acrididae)

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Abstract

DNA replication in the neo-X neo-Y sex determining system was studied by means of tritiated thymidine and autoradiography. Asynchronous replication was found in the X arm of the neo-X and the long arm of the neo-Y. In addition, striking asynchrony was also found for short isopycnotic homologous regions at the distal end of the autosmal arm of neo-X and the short arm of neo-Y to which pairing during meiosis is restricted. These short regions are asynchronous with respect to the heterochromatic segments as well as to the remaining proximal region of the autosomal euchromatic arm of neo-X. This difference in replication pattern within the same chromosome arm may be related to a differentiation between regions which are homozygous in both sexes and regions which are hemizygous in males.

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Literature

  • Lima De Faria, A.: Incorporation of tritiated thymidine into meiotic chromosomes. Science 130, 503–504 (1959).

    Google Scholar 

  • —: Differential uptake of tritiated thymidine into hetero- and euchromatin in Melanoplus and Secale. J. biophys. and biochem. Cytol. 6, 457–466 (1959).

    Google Scholar 

  • —: Initiation of DNA synthesis at specific segments in the meiotic chromosomes of Melanoplus. Hereditas (Lund) 47, 674–694 (1961).

    Google Scholar 

  • Mesa, A.: Cariologia de Dichroplus bergi. Rev. Agric. Piracicaba (Brasil) 37, 41–49 (1962).

    Google Scholar 

  • Saez, F. A.: Gradient of heterochromatinization in the evolution of the sexual system neo-X neo-Y. Port. Acta Biol., Ser. A 6, 111–138 (1963).

    Google Scholar 

  • —, and A. Vdiaz: Neo-X neo-Y system of sex determination in Xyleus laevipes (Orthoptera: Romaleinae). Texas Rep. Biol. Med. 18, 116–128 (1960).

    Google Scholar 

  • Taylor, J. H.: Distribution of tritium labelled DNA among chromosomes during meiosis, spermatogenesis in the grasshopper. J. Cell Biol. 25, 57–67 (1965).

    Google Scholar 

  • White, M. J. D.: Animal cytology and evolution. 2nd. ed. Cambridge, England: University Press 1954.

    Google Scholar 

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Authors and Affiliations

  1. Department of Cytogenetics, Instituto de Investigacion de Ciencias Biologicas Montevideo, Uruguay

    Manuel O. Diaz & Francisco A. Saez

Authors
  1. Manuel O. Diaz
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  2. Francisco A. Saez
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Additional information

This work was supported by U.S. Atomic Energy Commission Contract N AT (30-1) 3517 to Prof. F. A. Saez.

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Diaz, M.O., Saez, F.A. DNA synthesis in the neo-X neo-Y sex determination system of Dichroplus bergi (Orthoptera: Acrididae). Chromosoma 24, 10–16 (1968). https://doi.org/10.1007/BF00329603

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  • DOI: https://doi.org/10.1007/BF00329603

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