Cytogenetic studies in Sinipta dalmani Stål (Orthoptera: Acrididae). II. Effects of centric fusions on chiasma frequency and distribution

Spontaneous and polymorphic centric fusions were detected in a population of Sinipta dalmnni (2n: 23, XO male/XX female) from Entre Rios Province (Argentina). The spontaneous rearrangement affects 2 autosomes (M6 and M7) while the polymorphic one involves the sex chromosome and the fifth member of t...

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Guardado en:
Detalles Bibliográficos
Publicado: 1990
Materias:
Acrididae
Orthoptera
Sinipta
Sinipta dalmani
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0999193X_v22_n3_p263_Remis
http://hdl.handle.net/20.500.12110/paper_0999193X_v22_n3_p263_Remis
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0999193X_v22_n3_p263_Remis
record_format dspace
spelling paper:paper_0999193X_v22_n3_p263_Remis2023-06-08T15:59:19Z Cytogenetic studies in Sinipta dalmani Stål (Orthoptera: Acrididae). II. Effects of centric fusions on chiasma frequency and distribution Acrididae Orthoptera Sinipta Sinipta dalmani Spontaneous and polymorphic centric fusions were detected in a population of Sinipta dalmnni (2n: 23, XO male/XX female) from Entre Rios Province (Argentina). The spontaneous rearrangement affects 2 autosomes (M6 and M7) while the polymorphic one involves the sex chromosome and the fifth member of the complement. The former has irregular behaviour presenting a high frequency of non disjunctional orientation during metaphase I. This mutation does not affect either the frequency or the distribution of chiasmata in the bivalents involved. However, the polymorphic fusion has a significant influence on chiasma distribution, since an increment in the distal chiasma frequency in the affected bivalent was observed. These results indicate that the polymorphic mutation has an effect on intrachromosomal recombination, which would have adaptive significance, in contrast with the situation of spontaneous fusion which rarely persists in the population. © Elsevier/INRA. 1990 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0999193X_v22_n3_p263_Remis http://hdl.handle.net/20.500.12110/paper_0999193X_v22_n3_p263_Remis
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Acrididae
Orthoptera
Sinipta
Sinipta dalmani
spellingShingle Acrididae
Orthoptera
Sinipta
Sinipta dalmani
Cytogenetic studies in Sinipta dalmani Stål (Orthoptera: Acrididae). II. Effects of centric fusions on chiasma frequency and distribution
topic_facet Acrididae
Orthoptera
Sinipta
Sinipta dalmani
description Spontaneous and polymorphic centric fusions were detected in a population of Sinipta dalmnni (2n: 23, XO male/XX female) from Entre Rios Province (Argentina). The spontaneous rearrangement affects 2 autosomes (M6 and M7) while the polymorphic one involves the sex chromosome and the fifth member of the complement. The former has irregular behaviour presenting a high frequency of non disjunctional orientation during metaphase I. This mutation does not affect either the frequency or the distribution of chiasmata in the bivalents involved. However, the polymorphic fusion has a significant influence on chiasma distribution, since an increment in the distal chiasma frequency in the affected bivalent was observed. These results indicate that the polymorphic mutation has an effect on intrachromosomal recombination, which would have adaptive significance, in contrast with the situation of spontaneous fusion which rarely persists in the population. © Elsevier/INRA.
title Cytogenetic studies in Sinipta dalmani Stål (Orthoptera: Acrididae). II. Effects of centric fusions on chiasma frequency and distribution
title_short Cytogenetic studies in Sinipta dalmani Stål (Orthoptera: Acrididae). II. Effects of centric fusions on chiasma frequency and distribution
title_full Cytogenetic studies in Sinipta dalmani Stål (Orthoptera: Acrididae). II. Effects of centric fusions on chiasma frequency and distribution
title_fullStr Cytogenetic studies in Sinipta dalmani Stål (Orthoptera: Acrididae). II. Effects of centric fusions on chiasma frequency and distribution
title_full_unstemmed Cytogenetic studies in Sinipta dalmani Stål (Orthoptera: Acrididae). II. Effects of centric fusions on chiasma frequency and distribution
title_sort cytogenetic studies in sinipta dalmani stål (orthoptera: acrididae). ii. effects of centric fusions on chiasma frequency and distribution
publishDate 1990
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0999193X_v22_n3_p263_Remis
http://hdl.handle.net/20.500.12110/paper_0999193X_v22_n3_p263_Remis
_version_ 1768545658297384960

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