Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper
The relationship between the symmetry of the meiotic configuration and the type of meiotic orientation (disjunctional and non-disjunctional) in Robertsonian trivalents of Dichroplus pratensis (Melanoplinae, Acrididae) was analysed. The results indicate, first, that neither chromosomal size nor the r...
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1992
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018067X_v69_n3_p268_Mirol http://hdl.handle.net/20.500.12110/paper_0018067X_v69_n3_p268_Mirol |
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paper:paper_0018067X_v69_n3_p268_Mirol2023-06-08T14:39:22Z Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper Chiasmata Grasshopper Non-disjunction Robertsonian translocation The relationship between the symmetry of the meiotic configuration and the type of meiotic orientation (disjunctional and non-disjunctional) in Robertsonian trivalents of Dichroplus pratensis (Melanoplinae, Acrididae) was analysed. The results indicate, first, that neither chromosomal size nor the relation between the length of the chromosomes involved in each fusion are important factors for the determination of the orientation. Second, chiasmata localization, which in turn determines effective inter-centromeric distance, may be central. A high positive correlation between proximal chiasma frequency and non-disjunctional orientation at Prometaphase I and Metaphase I was found. These results are in agreement with the hypothesis that the shorter the inter-centromeric distance the greater is the probability that both centromeres migrate to the same pole. The importance of these results is also discussed in relation to the stability of the polymorphisms in this species. © The Genetical Society of Great Britain. 1992 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018067X_v69_n3_p268_Mirol http://hdl.handle.net/20.500.12110/paper_0018067X_v69_n3_p268_Mirol |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Chiasmata Grasshopper Non-disjunction Robertsonian translocation |
| spellingShingle |
Chiasmata Grasshopper Non-disjunction Robertsonian translocation Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper |
| topic_facet |
Chiasmata Grasshopper Non-disjunction Robertsonian translocation |
| description |
The relationship between the symmetry of the meiotic configuration and the type of meiotic orientation (disjunctional and non-disjunctional) in Robertsonian trivalents of Dichroplus pratensis (Melanoplinae, Acrididae) was analysed. The results indicate, first, that neither chromosomal size nor the relation between the length of the chromosomes involved in each fusion are important factors for the determination of the orientation. Second, chiasmata localization, which in turn determines effective inter-centromeric distance, may be central. A high positive correlation between proximal chiasma frequency and non-disjunctional orientation at Prometaphase I and Metaphase I was found. These results are in agreement with the hypothesis that the shorter the inter-centromeric distance the greater is the probability that both centromeres migrate to the same pole. The importance of these results is also discussed in relation to the stability of the polymorphisms in this species. © The Genetical Society of Great Britain. |
| title |
Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper |
| title_short |
Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper |
| title_full |
Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper |
| title_fullStr |
Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper |
| title_full_unstemmed |
Proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper |
| title_sort |
proximal chiasmata induce non-disjunctional orientation of robertsonian trivalents in a grasshopper |
| publishDate |
1992 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018067X_v69_n3_p268_Mirol http://hdl.handle.net/20.500.12110/paper_0018067X_v69_n3_p268_Mirol |
| _version_ |
1768544349863280640 |