Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper

The relationship between the symmetry of the meiotic configuration and the type of meiotic orientation (disjunctional and non-disjunctional) in Robertsonian trivalents of Dichroplus pratensis (Melanoplinae, Acrididae) was analysed. The results indicate, first, that neither chromosomal size nor the r...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Mirol, P.M., Bidau, C.J.
Formato: JOUR
Materias:
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0018067X_v69_n3_p268_Mirol
Aporte de:
id todo:paper_0018067X_v69_n3_p268_Mirol
record_format dspace
spelling todo:paper_0018067X_v69_n3_p268_Mirol2023-10-03T14:15:22Z Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper Mirol, P.M. Bidau, C.J. Chiasmata Grasshopper Non-disjunction Robertsonian translocation The relationship between the symmetry of the meiotic configuration and the type of meiotic orientation (disjunctional and non-disjunctional) in Robertsonian trivalents of Dichroplus pratensis (Melanoplinae, Acrididae) was analysed. The results indicate, first, that neither chromosomal size nor the relation between the length of the chromosomes involved in each fusion are important factors for the determination of the orientation. Second, chiasmata localization, which in turn determines effective inter-centromeric distance, may be central. A high positive correlation between proximal chiasma frequency and non-disjunctional orientation at Prometaphase I and Metaphase I was found. These results are in agreement with the hypothesis that the shorter the inter-centromeric distance the greater is the probability that both centromeres migrate to the same pole. The importance of these results is also discussed in relation to the stability of the polymorphisms in this species. © The Genetical Society of Great Britain. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0018067X_v69_n3_p268_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 Chiasmata
Grasshopper
Non-disjunction
Robertsonian translocation
spellingShingle Chiasmata
Grasshopper
Non-disjunction
Robertsonian translocation
Mirol, P.M.
Bidau, C.J.
Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper
topic_facet Chiasmata
Grasshopper
Non-disjunction
Robertsonian translocation
description The relationship between the symmetry of the meiotic configuration and the type of meiotic orientation (disjunctional and non-disjunctional) in Robertsonian trivalents of Dichroplus pratensis (Melanoplinae, Acrididae) was analysed. The results indicate, first, that neither chromosomal size nor the relation between the length of the chromosomes involved in each fusion are important factors for the determination of the orientation. Second, chiasmata localization, which in turn determines effective inter-centromeric distance, may be central. A high positive correlation between proximal chiasma frequency and non-disjunctional orientation at Prometaphase I and Metaphase I was found. These results are in agreement with the hypothesis that the shorter the inter-centromeric distance the greater is the probability that both centromeres migrate to the same pole. The importance of these results is also discussed in relation to the stability of the polymorphisms in this species. © The Genetical Society of Great Britain.
format JOUR
author Mirol, P.M.
Bidau, C.J.
author_facet Mirol, P.M.
Bidau, C.J.
author_sort Mirol, P.M.
title Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper
title_short Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper
title_full Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper
title_fullStr Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper
title_full_unstemmed Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper
title_sort proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper
url http://hdl.handle.net/20.500.12110/paper_0018067X_v69_n3_p268_Mirol
work_keys_str_mv AT mirolpm proximalchiasmatainducenondisjunctionalorientationofrobertsoniantrivalentsinagrasshopper
AT bidaucj proximalchiasmatainducenondisjunctionalorientationofrobertsoniantrivalentsinagrasshopper
_version_ 1782027850401972224