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Meiosis in gray voles of the subgenus Microtus (Rodentia, Arvicolinae) and in their hybrids

  • Animal Genetics
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Abstract

The results of light and electron microscopic (EM) studies of meiosis in Microtus arvalis males of the karyoform “arvalis” (2n = 46, NFa = 80), in hybrids between the chromosomal forms arvalis and obscurus (2n = 46, NFa = 68), in M. rossiaemeridionalis voles (2n = 54, NFa = 54), and in a hybrid between the species M. rossiaemeridionalis and kermanensis (2n = 54, NFa = 54) are presented. SC (synaptonemal complex) karyotypes of the parental forms and the hybrids were constructed on the basis of measurements of the length of autosomal SCs revealed by the EM analysis in spermatocytes at the stage of middle pachytene. The SC karyotypes of M. arvalis and the hybrids ♀ obscurus × ♂ arvalis consist of 22 synaptonemal complexes of autosomal bivalents and the axial elements of the synaptonemal complexes of the sex chromosomes X and Y. The SC karyotypes of M. rossiaemeridionalis and the hybrid M. rossiaemeridionalis × M. kermanensis consist of 26 synaptonemal complexes of autosomal bivalents and a sex bivalent; they differ only in the length of the Y chromosome axis (Y chromosome in the hybrid was inherited from M. kermanensis). Asynaptic configurations of the autosomal SCs were not observed in the hybrids. The SC axial elements of the X and Y chromosomes in the parental forms and in the hybrids were located close to each other throughout pachytene, but they did not form a synaptic region. The normal synapsis in sterile hybrids (M. rossiaemeridionalis × M. kermanensis) and the behavior of the sex chromosomes in meiosis in fertile and sterile hybrids are discussed in the context of specific features of meiosis and reproductive isolation.

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Correspondence to L. D. Safronova.

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Original Russian Text © L.D. Safronova, F.N. Golenishchev, E.V. Cherepanova, M.I. Baskevich, 2011, published in Genetika, 2011, Vol. 47, No. 7, pp. 968–974.

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Safronova, L.D., Golenishchev, F.N., Cherepanova, E.V. et al. Meiosis in gray voles of the subgenus Microtus (Rodentia, Arvicolinae) and in their hybrids. Russ J Genet 47, 857–863 (2011). https://doi.org/10.1134/S1022795411040107

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  • DOI: https://doi.org/10.1134/S1022795411040107

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