Distribution of chromosome frequencies within a hybrid zone of dichropfus pratensis (Melanoplinae, acrididae)

The widespread South American melanopline grasshopper Dichrophts pratensis is chromosomally polytypic. Seven different Robertsonian translocations between six L-autosomal pairs of the standard all-telocentric karyotype were detected; several races in Argentina are characterized for being polymorphic...

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Autores principales: Tosto, D.S., Bidau, C.J.
Formato: JOUR
Materias:
Centric fusion
Grasshopper
Hybrid zone
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0018067X_v67_n3_p299_Tosto
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0018067X_v67_n3_p299_Tosto
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spelling todo:paper_0018067X_v67_n3_p299_Tosto2023-10-03T14:15:21Z Distribution of chromosome frequencies within a hybrid zone of dichropfus pratensis (Melanoplinae, acrididae) Tosto, D.S. Bidau, C.J. Centric fusion Grasshopper Hybrid zone The widespread South American melanopline grasshopper Dichrophts pratensis is chromosomally polytypic. Seven different Robertsonian translocations between six L-autosomal pairs of the standard all-telocentric karyotype were detected; several races in Argentina are characterized for being polymorphic for one to three of these rearrangements. Within contact zones monobrachial homologies between fusion metacentrics thus occur, and hybrids (complex structural heterozygotes) are formed, in whose meiosis, quadrivalents and quinquivalents prone to non-convergent orientation and unbalanced segregation are produced. We analyse the karyotypic constitution of populations of D. pratensis from a hybrid zone between races that, although sharing the polymorphic 3 /4 fusion, differ for fusions with monobrachial homologies as described above. The Sierra de la Ventana hybrid zone has certain distinctive characteristics: the frequencies and type of the fusions vary abruptly within short distances; these fusions show a mosaic pattern distribution, all the monobrachially homologous fusion metacentrics were found in high frequency. The possible origin of this hybrid zone is discussed. © 1991 The Genetical Society of Great Britain. Fil:Tosto, D.S. 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_0018067X_v67_n3_p299_Tosto
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Centric fusion
Grasshopper
Hybrid zone
spellingShingle Centric fusion
Grasshopper
Hybrid zone
Tosto, D.S.
Bidau, C.J.
Distribution of chromosome frequencies within a hybrid zone of dichropfus pratensis (Melanoplinae, acrididae)
topic_facet Centric fusion
Grasshopper
Hybrid zone
description The widespread South American melanopline grasshopper Dichrophts pratensis is chromosomally polytypic. Seven different Robertsonian translocations between six L-autosomal pairs of the standard all-telocentric karyotype were detected; several races in Argentina are characterized for being polymorphic for one to three of these rearrangements. Within contact zones monobrachial homologies between fusion metacentrics thus occur, and hybrids (complex structural heterozygotes) are formed, in whose meiosis, quadrivalents and quinquivalents prone to non-convergent orientation and unbalanced segregation are produced. We analyse the karyotypic constitution of populations of D. pratensis from a hybrid zone between races that, although sharing the polymorphic 3 /4 fusion, differ for fusions with monobrachial homologies as described above. The Sierra de la Ventana hybrid zone has certain distinctive characteristics: the frequencies and type of the fusions vary abruptly within short distances; these fusions show a mosaic pattern distribution, all the monobrachially homologous fusion metacentrics were found in high frequency. The possible origin of this hybrid zone is discussed. © 1991 The Genetical Society of Great Britain.
format JOUR
author Tosto, D.S.
Bidau, C.J.
author_facet Tosto, D.S.
Bidau, C.J.
author_sort Tosto, D.S.
title Distribution of chromosome frequencies within a hybrid zone of dichropfus pratensis (Melanoplinae, acrididae)
title_short Distribution of chromosome frequencies within a hybrid zone of dichropfus pratensis (Melanoplinae, acrididae)
title_full Distribution of chromosome frequencies within a hybrid zone of dichropfus pratensis (Melanoplinae, acrididae)
title_fullStr Distribution of chromosome frequencies within a hybrid zone of dichropfus pratensis (Melanoplinae, acrididae)
title_full_unstemmed Distribution of chromosome frequencies within a hybrid zone of dichropfus pratensis (Melanoplinae, acrididae)
title_sort distribution of chromosome frequencies within a hybrid zone of dichropfus pratensis (melanoplinae, acrididae)
url http://hdl.handle.net/20.500.12110/paper_0018067X_v67_n3_p299_Tosto
work_keys_str_mv AT tostods distributionofchromosomefrequencieswithinahybridzoneofdichropfuspratensismelanoplinaeacrididae
AT bidaucj distributionofchromosomefrequencieswithinahybridzoneofdichropfuspratensismelanoplinaeacrididae
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