Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae)

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. S...

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Autores principales: Mirol, P.M., Bidau, C.J.
Formato: JOUR
Materias:
grasshopper
meiotic orientation
non-disjunction
Robertsonian translocation
trivalent
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00166707_v92_n3_p155_Mirol
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00166707_v92_n3_p155_Mirol2023-10-03T14:14:29Z Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae) Mirol, P.M. Bidau, C.J. grasshopper meiotic orientation non-disjunction Robertsonian translocation trivalent 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. Fil:Mirol, P.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bidau, C.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00166707_v92_n3_p155_Mirol
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic grasshopper
meiotic orientation
non-disjunction
Robertsonian translocation
trivalent
spellingShingle grasshopper
meiotic orientation
non-disjunction
Robertsonian translocation
trivalent
Mirol, P.M.
Bidau, C.J.
Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae)
topic_facet grasshopper
meiotic orientation
non-disjunction
Robertsonian translocation
trivalent
description 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.
format JOUR
author Mirol, P.M.
Bidau, C.J.
author_facet Mirol, P.M.
Bidau, C.J.
author_sort Mirol, P.M.
title Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae)
title_short Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae)
title_full Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae)
title_fullStr Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae)
title_full_unstemmed Non-random patterns of non-disjunctional orientation in trivalents of multiple Robertsonian heterozygotes of Dichroplus pratensis (Acrididae)
title_sort non-random patterns of non-disjunctional orientation in trivalents of multiple robertsonian heterozygotes of dichroplus pratensis (acrididae)
url http://hdl.handle.net/20.500.12110/paper_00166707_v92_n3_p155_Mirol
work_keys_str_mv AT mirolpm nonrandompatternsofnondisjunctionalorientationintrivalentsofmultiplerobertsonianheterozygotesofdichropluspratensisacrididae
AT bidaucj nonrandompatternsofnondisjunctionalorientationintrivalentsofmultiplerobertsonianheterozygotesofdichropluspratensisacrididae
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