Effects of supernumerary heterochromatin on chiasma condition in two species of Acrididae (Orthoptera)

Amblytropidia australis and Dichroplus elongatus were found to be polymorphic for supernumerary heterochromatin. In both, basic karyotypes are 2n=22+XO in males. Mitotically unstable extra chromosomes were detected in a population of A. australis. The Bs are telocentric and their number varies from...

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Autor principal: Remis, M.I.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00166707_v79_n1_p53_Remis
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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_v79_n1_p53_Remis2023-10-03T14:14:25Z Effects of supernumerary heterochromatin on chiasma condition in two species of Acrididae (Orthoptera) Remis, M.I. Amblytropidia australis and Dichroplus elongatus were found to be polymorphic for supernumerary heterochromatin. In both, basic karyotypes are 2n=22+XO in males. Mitotically unstable extra chromosomes were detected in a population of A. australis. The Bs are telocentric and their number varies from O to 2 within individuals. Mean frequencies of interstitial and total chiasmata at diplotene were compared between individuals with and without Bs. The mean frequency of interstitial chiasmata increases with the number of Bs per cell. A supernumerary terminal segment in S10 pair was observed in a heterozygous condition in several individuals of D. elongatus. The localization and frequency of chiasmata at diplotene were studied. The segment has an intrachromosomal effect since it modifies the location of chiasmata in the bivalent involved. © 1989 Kluwer Academic Publishers. Fil:Remis, M.I. 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_v79_n1_p53_Remis
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Amblytropidia australis and Dichroplus elongatus were found to be polymorphic for supernumerary heterochromatin. In both, basic karyotypes are 2n=22+XO in males. Mitotically unstable extra chromosomes were detected in a population of A. australis. The Bs are telocentric and their number varies from O to 2 within individuals. Mean frequencies of interstitial and total chiasmata at diplotene were compared between individuals with and without Bs. The mean frequency of interstitial chiasmata increases with the number of Bs per cell. A supernumerary terminal segment in S10 pair was observed in a heterozygous condition in several individuals of D. elongatus. The localization and frequency of chiasmata at diplotene were studied. The segment has an intrachromosomal effect since it modifies the location of chiasmata in the bivalent involved. © 1989 Kluwer Academic Publishers.
format JOUR
author Remis, M.I.
spellingShingle Remis, M.I.
Effects of supernumerary heterochromatin on chiasma condition in two species of Acrididae (Orthoptera)
author_facet Remis, M.I.
author_sort Remis, M.I.
title Effects of supernumerary heterochromatin on chiasma condition in two species of Acrididae (Orthoptera)
title_short Effects of supernumerary heterochromatin on chiasma condition in two species of Acrididae (Orthoptera)
title_full Effects of supernumerary heterochromatin on chiasma condition in two species of Acrididae (Orthoptera)
title_fullStr Effects of supernumerary heterochromatin on chiasma condition in two species of Acrididae (Orthoptera)
title_full_unstemmed Effects of supernumerary heterochromatin on chiasma condition in two species of Acrididae (Orthoptera)
title_sort effects of supernumerary heterochromatin on chiasma condition in two species of acrididae (orthoptera)
url http://hdl.handle.net/20.500.12110/paper_00166707_v79_n1_p53_Remis
work_keys_str_mv AT remismi effectsofsupernumeraryheterochromatinonchiasmaconditionintwospeciesofacrididaeorthoptera
_version_ 1807315319114432512

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