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Abstract:

Six populations of Sinipta dalmani from the provinces of Buenos Aires and Entre Rios (Argentina) were analyzed. The populations of "El Palmar" National Park (Entre Rios) were polymorphic for pericentric inversions in pairs M4 and M7 and for a centric fusion involving pair M5 and the X chromosome. The M4 inversion remained similar over time and the karyomorphic frequencies did not depart from those expected according to the Hardy-Weinberg equilibrium. The analysis of chiasma frequency and distribution showed clear intra- and interchromosome effects of the different chromosome rearrangements. Both inversions and centric fusions were related with total or partial crossing over restriction in heterozygous condition, leading to a genetic differentiation between rearranged and non-rearranged chromosomes. The chromosome polymorphisms analyzed herein were associated with an increase in the number of terminal chiasmata both in the rearranged chromosomes (heterozygous centric fusion and homozygous M4 inversion) and in the other chromosomes (M4 inversion). Our results showed that the chromosome polymorphisms in S. dalmani may be associated with a significant decrease in genetic recombination, which may explain in part their maintenance in some areas of its geographical distribution. Copyright by the Brazilian Society of Genetics.

Registro:

Documento: Artículo
Título:Chromosome polymorphisms in natural populations of the South American grasshopper Sinipta dalmani
Autor:Remis, M.I.
Filiación:Departamento de Ecología Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Brazil
Palabras clave:Centric fusion; Chiasma conditions; Grasshopper; Pericentric inversion; animal genetics; Argentina; article; chromosome analysis; chromosome chiasm; chromosome rearrangement; controlled study; gene frequency; gene fusion; genetic linkage; genetic polymorphism; genetic recombination; genetic variability; geographic distribution; grasshopper; heterozygosity; homozygosity; nonhuman; Sinipta dalmani; X chromosome; Schistocerca americana; Sinipta dalmani
Año:2008
Volumen:31
Número:1
Página de inicio:42
Página de fin:48
DOI: http://dx.doi.org/10.1590/S1415-47572008000100009
Título revista:Genetics and Molecular Biology
Título revista abreviado:Genet. Mol. Biol.
ISSN:14154757
CODEN:GMBIF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14154757_v31_n1_p42_Remis

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Citas:

---------- APA ----------
(2008) . Chromosome polymorphisms in natural populations of the South American grasshopper Sinipta dalmani. Genetics and Molecular Biology, 31(1), 42-48.
http://dx.doi.org/10.1590/S1415-47572008000100009
---------- CHICAGO ----------
Remis, M.I. "Chromosome polymorphisms in natural populations of the South American grasshopper Sinipta dalmani" . Genetics and Molecular Biology 31, no. 1 (2008) : 42-48.
http://dx.doi.org/10.1590/S1415-47572008000100009
---------- MLA ----------
Remis, M.I. "Chromosome polymorphisms in natural populations of the South American grasshopper Sinipta dalmani" . Genetics and Molecular Biology, vol. 31, no. 1, 2008, pp. 42-48.
http://dx.doi.org/10.1590/S1415-47572008000100009
---------- VANCOUVER ----------
Remis, M.I. Chromosome polymorphisms in natural populations of the South American grasshopper Sinipta dalmani. Genet. Mol. Biol. 2008;31(1):42-48.
http://dx.doi.org/10.1590/S1415-47572008000100009