Heterochromosomes and Nor-Localization in the Common Lizard, Lacerta vivipara Jacquin, from Russia

Valentina F. Orlova, A. I. Kozlovskii

Abstract


Karyotypes of the common lizard, Lacerta vivipara (2n = 36 in males; 2n = 35 in females) from Moscow, Tver’, and Ivanovo regions were studied using standard and differentiated staining. For the first time sex chromosomes of females were reliably identified with the help of G-staining: subtelocentric W and acrocentric Z1, Z2. Successive staining (G-NOR) demonstrated localization of the ribosomal gene clusters in the telomer zones of the 15th autosome pair. Analysis of the metaphase plates series stained by silver allowed the determination of the frequency of NOR activity in one or both homologues as well as the frequency of associations between them.

Keywords


Reptilia; Sauria; Lacertidae; Lacerta vivipara; chromosomes; differentiated staining; Russia

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References


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DOI: https://doi.org/10.30906/1026-2296-1996-3-2-191-195

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