Cytogeography and the evolutionary significance of B chromosomes in relation to inverted rearrangements in a grasshopper species
The analysis of geographic distribution of polymorphic cytological markers, briefly termed as cytogeography, can be considered an important tool to be applied when studying the evolutionary significance of chromosome variability within a species, either to unravel the adaptive significance of chromo...
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2004
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14248581_v106_n2-4_p351_Colombo http://hdl.handle.net/20.500.12110/paper_14248581_v106_n2-4_p351_Colombo |
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paper:paper_14248581_v106_n2-4_p351_Colombo2023-06-08T16:14:00Z Cytogeography and the evolutionary significance of B chromosomes in relation to inverted rearrangements in a grasshopper species adaptation autosome body size chromosome rearrangement chromosome variant controlled study evolution genetic polymorphism geographic distribution grasshopper nonhuman phenotype priority journal review statistical significance Animals Chromosomes Demography Evolution, Molecular Grasshoppers Inversion, Chromosome Species Specificity Trimerotropis The analysis of geographic distribution of polymorphic cytological markers, briefly termed as cytogeography, can be considered an important tool to be applied when studying the evolutionary significance of chromosome variability within a species, either to unravel the adaptive significance of chromosome polymorphisms or to investigate the parasitic nature of some genomic elements. In this article we review cytogeographical studies in Trimerotropis pallidipennis, a grasshopper species whose South American populations display geographical patterns of distribution of inversion and B chromosome polymorphisms. Several lines of evidence that issue from the analysis of the geographic distribution of polymorphic markers suggest that inverted chromosomes are special sequences that are maintained by deterministic forces. On the other hand, the pattern of distribution of B chromosome polymorphism clearly demonstrates its selfish nature, being more frequent in those populations in central environments. We also present the analysis of 272 individuals of T. pallidipennis from Uspallata, and demonstrate that Bs in this population have some influence on body size, enlarging many of the morphometric characters of individuals and we propose it could be the consequence of its genotypic disequilibrium with one inversion. These investigations are finally discussed with regard to the models proposed for the maintenance of B chromosomes in natural populations and in relation to the possible interactions with chromosome inversions. Copyright © 2004 S. Karger AG, Basel. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14248581_v106_n2-4_p351_Colombo http://hdl.handle.net/20.500.12110/paper_14248581_v106_n2-4_p351_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 |
adaptation autosome body size chromosome rearrangement chromosome variant controlled study evolution genetic polymorphism geographic distribution grasshopper nonhuman phenotype priority journal review statistical significance Animals Chromosomes Demography Evolution, Molecular Grasshoppers Inversion, Chromosome Species Specificity Trimerotropis |
| spellingShingle |
adaptation autosome body size chromosome rearrangement chromosome variant controlled study evolution genetic polymorphism geographic distribution grasshopper nonhuman phenotype priority journal review statistical significance Animals Chromosomes Demography Evolution, Molecular Grasshoppers Inversion, Chromosome Species Specificity Trimerotropis Cytogeography and the evolutionary significance of B chromosomes in relation to inverted rearrangements in a grasshopper species |
| topic_facet |
adaptation autosome body size chromosome rearrangement chromosome variant controlled study evolution genetic polymorphism geographic distribution grasshopper nonhuman phenotype priority journal review statistical significance Animals Chromosomes Demography Evolution, Molecular Grasshoppers Inversion, Chromosome Species Specificity Trimerotropis |
| description |
The analysis of geographic distribution of polymorphic cytological markers, briefly termed as cytogeography, can be considered an important tool to be applied when studying the evolutionary significance of chromosome variability within a species, either to unravel the adaptive significance of chromosome polymorphisms or to investigate the parasitic nature of some genomic elements. In this article we review cytogeographical studies in Trimerotropis pallidipennis, a grasshopper species whose South American populations display geographical patterns of distribution of inversion and B chromosome polymorphisms. Several lines of evidence that issue from the analysis of the geographic distribution of polymorphic markers suggest that inverted chromosomes are special sequences that are maintained by deterministic forces. On the other hand, the pattern of distribution of B chromosome polymorphism clearly demonstrates its selfish nature, being more frequent in those populations in central environments. We also present the analysis of 272 individuals of T. pallidipennis from Uspallata, and demonstrate that Bs in this population have some influence on body size, enlarging many of the morphometric characters of individuals and we propose it could be the consequence of its genotypic disequilibrium with one inversion. These investigations are finally discussed with regard to the models proposed for the maintenance of B chromosomes in natural populations and in relation to the possible interactions with chromosome inversions. Copyright © 2004 S. Karger AG, Basel. |
| title |
Cytogeography and the evolutionary significance of B chromosomes in relation to inverted rearrangements in a grasshopper species |
| title_short |
Cytogeography and the evolutionary significance of B chromosomes in relation to inverted rearrangements in a grasshopper species |
| title_full |
Cytogeography and the evolutionary significance of B chromosomes in relation to inverted rearrangements in a grasshopper species |
| title_fullStr |
Cytogeography and the evolutionary significance of B chromosomes in relation to inverted rearrangements in a grasshopper species |
| title_full_unstemmed |
Cytogeography and the evolutionary significance of B chromosomes in relation to inverted rearrangements in a grasshopper species |
| title_sort |
cytogeography and the evolutionary significance of b chromosomes in relation to inverted rearrangements in a grasshopper species |
| publishDate |
2004 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14248581_v106_n2-4_p351_Colombo http://hdl.handle.net/20.500.12110/paper_14248581_v106_n2-4_p351_Colombo |
| _version_ |
1768543197640785920 |