Chromosome polymorphisms and natural selection in leptysma argentina (Orthoptera). ii. gametic phase disequilibrium and differential adult male viability

Despite the wealth of information concerning inversions in natural selection (mainly in Drosophila), cases of centric fusions or supernumerary segments involved in selective processes have been less well documented. In the present study 149 males from a population of the South American grasshopper L...

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Detalles Bibliográficos
Publicado: 1993
Materias:
Centric fusion
Gametic disequilibrium
Natural selection
Supernumerary segment
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018067X_v71_n3_p295_Colombo
http://hdl.handle.net/20.500.12110/paper_0018067X_v71_n3_p295_Colombo
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0018067X_v71_n3_p295_Colombo
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spelling paper:paper_0018067X_v71_n3_p295_Colombo2025-07-30T17:21:57Z Chromosome polymorphisms and natural selection in leptysma argentina (Orthoptera). ii. gametic phase disequilibrium and differential adult male viability Centric fusion Gametic disequilibrium Natural selection Supernumerary segment Despite the wealth of information concerning inversions in natural selection (mainly in Drosophila), cases of centric fusions or supernumerary segments involved in selective processes have been less well documented. In the present study 149 males from a population of the South American grasshopper Leptysma argentina (whose generations are annual and discrete) polymorphic for a centric fusion (F) and a supernumerary segment (sj) were sampled in October and December 1991 (the beginning and the end of the adult life span in this species) with the purpose of: (i) detecting departures from formal null models, such as Hardy-Weinberg and gametic phase equilibria; and (ii) detecting differential adult male viability among karyotypes. Both methods allow the detection of natural selection occurring in the wild. The comparison between both age classes revealed significant differences in karyotypic frequencies, which gives clear proof of ongoing selection. Gametic phase disequilibrium was not detected in young males but it was significant in aged males: favoured gametes are consistent with favoured karyotypes. Furthermore, while the young male sample does not depart significantly from Hardy-Weinberg equilibrium nor the hypothesis of homogeneity, both tests were significant in the aged male sample. Results signify that strong selective forces act in the adult stage, at least in males, while other components of natural selection remain obscure. The possible causes of selection acting on both polymorphisms are analysed and discussed. © 1993 The Genetical Society of Great Britain. 1993 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018067X_v71_n3_p295_Colombo http://hdl.handle.net/20.500.12110/paper_0018067X_v71_n3_p295_Colombo
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
Gametic disequilibrium
Natural selection
Supernumerary segment
spellingShingle Centric fusion
Gametic disequilibrium
Natural selection
Supernumerary segment
Chromosome polymorphisms and natural selection in leptysma argentina (Orthoptera). ii. gametic phase disequilibrium and differential adult male viability
topic_facet Centric fusion
Gametic disequilibrium
Natural selection
Supernumerary segment
description Despite the wealth of information concerning inversions in natural selection (mainly in Drosophila), cases of centric fusions or supernumerary segments involved in selective processes have been less well documented. In the present study 149 males from a population of the South American grasshopper Leptysma argentina (whose generations are annual and discrete) polymorphic for a centric fusion (F) and a supernumerary segment (sj) were sampled in October and December 1991 (the beginning and the end of the adult life span in this species) with the purpose of: (i) detecting departures from formal null models, such as Hardy-Weinberg and gametic phase equilibria; and (ii) detecting differential adult male viability among karyotypes. Both methods allow the detection of natural selection occurring in the wild. The comparison between both age classes revealed significant differences in karyotypic frequencies, which gives clear proof of ongoing selection. Gametic phase disequilibrium was not detected in young males but it was significant in aged males: favoured gametes are consistent with favoured karyotypes. Furthermore, while the young male sample does not depart significantly from Hardy-Weinberg equilibrium nor the hypothesis of homogeneity, both tests were significant in the aged male sample. Results signify that strong selective forces act in the adult stage, at least in males, while other components of natural selection remain obscure. The possible causes of selection acting on both polymorphisms are analysed and discussed. © 1993 The Genetical Society of Great Britain.
title Chromosome polymorphisms and natural selection in leptysma argentina (Orthoptera). ii. gametic phase disequilibrium and differential adult male viability
title_short Chromosome polymorphisms and natural selection in leptysma argentina (Orthoptera). ii. gametic phase disequilibrium and differential adult male viability
title_full Chromosome polymorphisms and natural selection in leptysma argentina (Orthoptera). ii. gametic phase disequilibrium and differential adult male viability
title_fullStr Chromosome polymorphisms and natural selection in leptysma argentina (Orthoptera). ii. gametic phase disequilibrium and differential adult male viability
title_full_unstemmed Chromosome polymorphisms and natural selection in leptysma argentina (Orthoptera). ii. gametic phase disequilibrium and differential adult male viability
title_sort chromosome polymorphisms and natural selection in leptysma argentina (orthoptera). ii. gametic phase disequilibrium and differential adult male viability
publishDate 1993
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018067X_v71_n3_p295_Colombo
http://hdl.handle.net/20.500.12110/paper_0018067X_v71_n3_p295_Colombo
_version_ 1840324855306649600

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