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Abstract:

Metaphase I orientation of centric fusion trivalents was studied in 24 single, 19 double and 3 triple heterozygotes of Dichroplus pratensis. Different populations of this South American melanopline grasshopper are polymorphic for seven Robertsonian fusions, and the polymorphisms seem to be stable. Several cytogenetic factors involved in the orientation and segregation of the meiotic configurations such as chromosomal length, symmetry and number and position of chiasmata, have been analysed in previous works. In this paper we study another factor that is relevant in the above respect in individuals with more than one heterozygous fusion: interaction among configurations regarding orientation. Our results indicate that, when there are two or three trivalents present in the MI cell, there is an interaction in such a way that the number of metaphases in which the two or three trivalents are non-disjunctionally oriented is always significantly higher than expected under a hypothesis of independence. However, the number of cells in which all trivalents are disjunctionally oriented does not decrease significantly, so an increase of unbalanced gametes due to this factor is not expected. The stability of the polymorphisms would thus not be affected. © 1994 Kluwer Academic Publishers.

Registro:

Documento: Artículo
Título:Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae)
Autor:Mirol, P.M.; Bidau, C.J.
Filiación:Laboratorio de Genética, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, Buenos Aires, 1428, Argentina
Departamento de Genética, Facultad de Ciencias Exactas, Químicas y Naturales, Universidad Nacional de Misiones, Félix de Azara 1552, 6 piso, Posadas, 3300, Argentina
Palabras clave:grasshopper; meiotic orientation; non-disjunction; Robertsonian translocation; trivalent
Año:1994
Volumen:92
Número:3
Página de inicio:155
Página de fin:164
DOI: http://dx.doi.org/10.1007/BF00132534
Título revista:Genetica
Título revista abreviado:Genetica
ISSN:00166707
CODEN:GENEA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v92_n3_p155_Mirol

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Citas:

---------- APA ----------
Mirol, P.M. & Bidau, C.J. (1994) . Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae). Genetica, 92(3), 155-164.
http://dx.doi.org/10.1007/BF00132534
---------- CHICAGO ----------
Mirol, P.M., Bidau, C.J. "Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae)" . Genetica 92, no. 3 (1994) : 155-164.
http://dx.doi.org/10.1007/BF00132534
---------- MLA ----------
Mirol, P.M., Bidau, C.J. "Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae)" . Genetica, vol. 92, no. 3, 1994, pp. 155-164.
http://dx.doi.org/10.1007/BF00132534
---------- VANCOUVER ----------
Mirol, P.M., Bidau, C.J. Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae). Genetica. 1994;92(3):155-164.
http://dx.doi.org/10.1007/BF00132534