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Abstract:

Karyotype and meiotic behaviour were analyzed in two Argentine populations of S. longicornis (G. Tos). It was found that the basic karyotype in this species is composed by 23 telocentric chromosomes in males (22 autosomes+X) with a sexual mechanism [formula omitted]. Chromosome variations involving a centric fusion, a pericentric inversion, elastic constrictions and a supernumerary segment were detected. The study of chiasma frequency and movement allowed to establish that: 1) there is a continuous chimasma movement and terminalization from diplotene to MI; 2) the differences between populations are non significant though there is a high within population variability; 3) the rearrangements observed have no obvious influence on chiasma conditions. C-banded meiotic karyogram at diplotene, made with Ba (OH)2 and 2 × SSC, is described. It demonstrates centromeric, interstitial and telomeric bands in meiotic autosomes. The X and megameric pair were totally heterochromatic. © 1984, Japan Mendel Society, International Society of Cytology. All rights reserved.

Registro:

Documento: Artículo
Título:Chromosome Polymorphisms and Chiasmo Frequency in two Populations of Sfaurorhectus longicornis (Orthoptera-Acrididae)
Autor:Vilardi, J.C.
Filiación:Laboratorio de Genetica, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Año:1984
Volumen:49
Número:3
Página de inicio:513
Página de fin:528
DOI: http://dx.doi.org/10.1508/cytologia.49.513
Título revista:Cytologia
Título revista abreviado:Cytologia
ISSN:00114545
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00114545_v49_n3_p513_Vilardi

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Citas:

---------- APA ----------
(1984) . Chromosome Polymorphisms and Chiasmo Frequency in two Populations of Sfaurorhectus longicornis (Orthoptera-Acrididae). Cytologia, 49(3), 513-528.
http://dx.doi.org/10.1508/cytologia.49.513
---------- CHICAGO ----------
Vilardi, J.C. "Chromosome Polymorphisms and Chiasmo Frequency in two Populations of Sfaurorhectus longicornis (Orthoptera-Acrididae)" . Cytologia 49, no. 3 (1984) : 513-528.
http://dx.doi.org/10.1508/cytologia.49.513
---------- MLA ----------
Vilardi, J.C. "Chromosome Polymorphisms and Chiasmo Frequency in two Populations of Sfaurorhectus longicornis (Orthoptera-Acrididae)" . Cytologia, vol. 49, no. 3, 1984, pp. 513-528.
http://dx.doi.org/10.1508/cytologia.49.513
---------- VANCOUVER ----------
Vilardi, J.C. Chromosome Polymorphisms and Chiasmo Frequency in two Populations of Sfaurorhectus longicornis (Orthoptera-Acrididae). Cytologia. 1984;49(3):513-528.
http://dx.doi.org/10.1508/cytologia.49.513