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Abstract:

Trivalents resulting from polymorphic Robertsonian rearrangements must have a regular orientation in metaphase I if the polymorphisms are to be maintained. It has been argued that redistribution of proximal and interstitial chiasmata to more distal positions is necessary for a convergent orientation, the only one that produces viable gametes. Cornops aquaticumis a South-American grasshopper that lives and feeds on water-hyacinths, and has three polymorphic Robertsonian rearrangements in its southernmost distribution area in Central Argentina and Uruguay. The orientation of trivalents in metaphase I, the formation of abnormal spermatids and the frequency and position of chiasmata in the trivalents, was analysed in a polymorphic population of C. aquaticus. In this study we observed a correlation between the number of trivalents with the frequency of abnormal spermatids; additionally, the number of chiasmata, especially proximal and interstitial ones, was strongly correlated with the frequency of the linear orientation. Therefore we confirmed our previous assumption, based on other evidence, that the chiasmata redistribution in fusion carriers is essential to the maintenance of the polymorphisms. Copyright © 2009, Sociedade Brasileira de Genética.

Registro:

Documento: Artículo
Título:Metaphase I orientation of Robertsonian trivalents in the water-hyacinth grasshopper, Cornops aquaticum (Acrididae, Orthoptera)
Autor:Colombo, P.C.
Filiación:Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Cd. Universitaria, Buenos Aires, Argentina
Palabras clave:Cornops aquaticum; Metaphase I orientation; Robertsonian rearrangements; Trivalents; anaphase; animal tissue; article; chromosome rearrangement; Cornops aquaticum; correlation analysis; cytogenetics; enzyme polymorphism; heterozygosity; male; metaphase; molecular evolution; nonhuman; Orthoptera; Robertsonian rearrangement; spermatid; Acrididae; Cornops; Cornops aquaticum; Eichhornia crassipes; Orthoptera; Robertsonia; Schistocerca americana
Año:2009
Volumen:32
Número:1
Página de inicio:91
Página de fin:95
DOI: http://dx.doi.org/10.1590/S1415-47572009005000019
Título revista:Genetics and Molecular Biology
Título revista abreviado:Genet. Mol. Biol.
ISSN:14154757
CODEN:GMBIF
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_14154757_v32_n1_p91_Colombo.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14154757_v32_n1_p91_Colombo

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Citas:

---------- APA ----------
(2009) . Metaphase I orientation of Robertsonian trivalents in the water-hyacinth grasshopper, Cornops aquaticum (Acrididae, Orthoptera). Genetics and Molecular Biology, 32(1), 91-95.
http://dx.doi.org/10.1590/S1415-47572009005000019
---------- CHICAGO ----------
Colombo, P.C. "Metaphase I orientation of Robertsonian trivalents in the water-hyacinth grasshopper, Cornops aquaticum (Acrididae, Orthoptera)" . Genetics and Molecular Biology 32, no. 1 (2009) : 91-95.
http://dx.doi.org/10.1590/S1415-47572009005000019
---------- MLA ----------
Colombo, P.C. "Metaphase I orientation of Robertsonian trivalents in the water-hyacinth grasshopper, Cornops aquaticum (Acrididae, Orthoptera)" . Genetics and Molecular Biology, vol. 32, no. 1, 2009, pp. 91-95.
http://dx.doi.org/10.1590/S1415-47572009005000019
---------- VANCOUVER ----------
Colombo, P.C. Metaphase I orientation of Robertsonian trivalents in the water-hyacinth grasshopper, Cornops aquaticum (Acrididae, Orthoptera). Genet. Mol. Biol. 2009;32(1):91-95.
http://dx.doi.org/10.1590/S1415-47572009005000019