Influence of a rare unstable B-chromosome on chiasma frequency and nonhaploid sperm production in Dichroplus pratensis (Melanoplinae, Acrididae)

Three B-containing individuals of Dichroplus pratensis were found among 300 males collected in several Argentine localities. The B-chromosome is a partially euchromatic short telocentric and it is mitotically unstable. The B-chromosome number of testis cells ranged from 0 to 4 in two males and from...

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Autor principal: Bidau, C.J.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00166707_v73_n3_p201_Bidau
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00166707_v73_n3_p201_Bidau2023-10-03T14:14:23Z Influence of a rare unstable B-chromosome on chiasma frequency and nonhaploid sperm production in Dichroplus pratensis (Melanoplinae, Acrididae) Bidau, C.J. Three B-containing individuals of Dichroplus pratensis were found among 300 males collected in several Argentine localities. The B-chromosome is a partially euchromatic short telocentric and it is mitotically unstable. The B-chromosome number of testis cells ranged from 0 to 4 in two males and from 0 to 3 in the remaining one; this variation was inter- as well as intrafollicular. Meiotic behaviour of the Bs was very regular, association of Bs was usually chiasmate and no lagging univalents were observed during first division. The presence of Bs increased the production rate of abnormal spermatids and this effect was more pronounced in follicles with odd numbers of Bs. Chiasma frequency and between-cell variance were also increased in B-containing cells. A possible interaction between the Bs and the polymorphic centric fusions present in the species is discussed in relation to chiasma frequency determination. © 1987 Dr W. Junk Publishers. 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_v73_n3_p201_Bidau
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Three B-containing individuals of Dichroplus pratensis were found among 300 males collected in several Argentine localities. The B-chromosome is a partially euchromatic short telocentric and it is mitotically unstable. The B-chromosome number of testis cells ranged from 0 to 4 in two males and from 0 to 3 in the remaining one; this variation was inter- as well as intrafollicular. Meiotic behaviour of the Bs was very regular, association of Bs was usually chiasmate and no lagging univalents were observed during first division. The presence of Bs increased the production rate of abnormal spermatids and this effect was more pronounced in follicles with odd numbers of Bs. Chiasma frequency and between-cell variance were also increased in B-containing cells. A possible interaction between the Bs and the polymorphic centric fusions present in the species is discussed in relation to chiasma frequency determination. © 1987 Dr W. Junk Publishers.
format JOUR
author Bidau, C.J.
spellingShingle Bidau, C.J.
Influence of a rare unstable B-chromosome on chiasma frequency and nonhaploid sperm production in Dichroplus pratensis (Melanoplinae, Acrididae)
author_facet Bidau, C.J.
author_sort Bidau, C.J.
title Influence of a rare unstable B-chromosome on chiasma frequency and nonhaploid sperm production in Dichroplus pratensis (Melanoplinae, Acrididae)
title_short Influence of a rare unstable B-chromosome on chiasma frequency and nonhaploid sperm production in Dichroplus pratensis (Melanoplinae, Acrididae)
title_full Influence of a rare unstable B-chromosome on chiasma frequency and nonhaploid sperm production in Dichroplus pratensis (Melanoplinae, Acrididae)
title_fullStr Influence of a rare unstable B-chromosome on chiasma frequency and nonhaploid sperm production in Dichroplus pratensis (Melanoplinae, Acrididae)
title_full_unstemmed Influence of a rare unstable B-chromosome on chiasma frequency and nonhaploid sperm production in Dichroplus pratensis (Melanoplinae, Acrididae)
title_sort influence of a rare unstable b-chromosome on chiasma frequency and nonhaploid sperm production in dichroplus pratensis (melanoplinae, acrididae)
url http://hdl.handle.net/20.500.12110/paper_00166707_v73_n3_p201_Bidau
work_keys_str_mv AT bidaucj influenceofarareunstablebchromosomeonchiasmafrequencyandnonhaploidspermproductionindichropluspratensismelanoplinaeacrididae
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