Meiotic studies in largus rufipennis (Castelnau) (largidae, heteroptera): Frequency and behaviour of ring bivalents, univalents and b chromosomes
Cytogenetic analysis of an Argentine population of Largus rufipennis has revealed the presence of autosomal univalents and a supernumerary chromosome. All individuals present univalents at a variable frequency (0.31-21.83 per cent), and half of them carry a B chromosome at low frequency. Both the B...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_0018067X_v71_n1_p33_Mola |
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todo:paper_0018067X_v71_n1_p33_Mola2023-10-03T14:15:23Z Meiotic studies in largus rufipennis (Castelnau) (largidae, heteroptera): Frequency and behaviour of ring bivalents, univalents and b chromosomes Mola, L.M. Papeschi, A.G. B chromosome Chiasma frequency Holokinetic chromosomes Ring bivalents Univalents Cytogenetic analysis of an Argentine population of Largus rufipennis has revealed the presence of autosomal univalents and a supernumerary chromosome. All individuals present univalents at a variable frequency (0.31-21.83 per cent), and half of them carry a B chromosome at low frequency. Both the B chromosome and univalents divide equationally at anaphase I and reductionally at the second division. The present population is very heterogeneous with respect to chiasma frequency and distribution: desynapsis is responsible for the appearance of univalents, while the presence of the B chromosome is associated with an increase in chiasma frequency. However, two individuals that lack the supernumerary chromosome show a strikingly high chiasma frequency. This variation in chiasma frequency should be the result of the interaction between genes controlling chiasmata and the environmental conditions (both internal and external) together with the genetic background of each individual. © 1993 The Genetical Society of Great Britain. Fil:Mola, L.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Papeschi, A.G. 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_0018067X_v71_n1_p33_Mola |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
B chromosome Chiasma frequency Holokinetic chromosomes Ring bivalents Univalents |
| spellingShingle |
B chromosome Chiasma frequency Holokinetic chromosomes Ring bivalents Univalents Mola, L.M. Papeschi, A.G. Meiotic studies in largus rufipennis (Castelnau) (largidae, heteroptera): Frequency and behaviour of ring bivalents, univalents and b chromosomes |
| topic_facet |
B chromosome Chiasma frequency Holokinetic chromosomes Ring bivalents Univalents |
| description |
Cytogenetic analysis of an Argentine population of Largus rufipennis has revealed the presence of autosomal univalents and a supernumerary chromosome. All individuals present univalents at a variable frequency (0.31-21.83 per cent), and half of them carry a B chromosome at low frequency. Both the B chromosome and univalents divide equationally at anaphase I and reductionally at the second division. The present population is very heterogeneous with respect to chiasma frequency and distribution: desynapsis is responsible for the appearance of univalents, while the presence of the B chromosome is associated with an increase in chiasma frequency. However, two individuals that lack the supernumerary chromosome show a strikingly high chiasma frequency. This variation in chiasma frequency should be the result of the interaction between genes controlling chiasmata and the environmental conditions (both internal and external) together with the genetic background of each individual. © 1993 The Genetical Society of Great Britain. |
| format |
JOUR |
| author |
Mola, L.M. Papeschi, A.G. |
| author_facet |
Mola, L.M. Papeschi, A.G. |
| author_sort |
Mola, L.M. |
| title |
Meiotic studies in largus rufipennis (Castelnau) (largidae, heteroptera): Frequency and behaviour of ring bivalents, univalents and b chromosomes |
| title_short |
Meiotic studies in largus rufipennis (Castelnau) (largidae, heteroptera): Frequency and behaviour of ring bivalents, univalents and b chromosomes |
| title_full |
Meiotic studies in largus rufipennis (Castelnau) (largidae, heteroptera): Frequency and behaviour of ring bivalents, univalents and b chromosomes |
| title_fullStr |
Meiotic studies in largus rufipennis (Castelnau) (largidae, heteroptera): Frequency and behaviour of ring bivalents, univalents and b chromosomes |
| title_full_unstemmed |
Meiotic studies in largus rufipennis (Castelnau) (largidae, heteroptera): Frequency and behaviour of ring bivalents, univalents and b chromosomes |
| title_sort |
meiotic studies in largus rufipennis (castelnau) (largidae, heteroptera): frequency and behaviour of ring bivalents, univalents and b chromosomes |
| url |
http://hdl.handle.net/20.500.12110/paper_0018067X_v71_n1_p33_Mola |
| work_keys_str_mv |
AT molalm meioticstudiesinlargusrufipenniscastelnaulargidaeheteropterafrequencyandbehaviourofringbivalentsunivalentsandbchromosomes AT papeschiag meioticstudiesinlargusrufipenniscastelnaulargidaeheteropterafrequencyandbehaviourofringbivalentsunivalentsandbchromosomes |
| _version_ |
1807314581598502912 |