Meiotic studies in Acanonicus hahni (Stål) (Coreidae, Heteroptera) I. Behaviour of univalents in desynaptic individuals
Male meiosis was studied in a population of Acanonicus hahni (Stål), and nine of the sixteen individuals analyzed showed desynapsis. The frequency of univalents varied from one to seven percent in eight of them, while in the ninth the percentage of cells with univalents was higher (12%). The univale...
| Autores principales: | , |
|---|---|
| Formato: | JOUR |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00166707_v80_n1_p31_Papeschi |
| Aporte de: |
| id |
todo:paper_00166707_v80_n1_p31_Papeschi |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_00166707_v80_n1_p31_Papeschi2023-10-03T14:14:25Z Meiotic studies in Acanonicus hahni (Stål) (Coreidae, Heteroptera) I. Behaviour of univalents in desynaptic individuals Papeschi, A.G. Mola, L.M. Male meiosis was studied in a population of Acanonicus hahni (Stål), and nine of the sixteen individuals analyzed showed desynapsis. The frequency of univalents varied from one to seven percent in eight of them, while in the ninth the percentage of cells with univalents was higher (12%). The univalents auto-orientate at metaphase I in the center of the ring formed by autosomal bivalents and divide equationally at anaphase I; at metaphase II they show touch-and-go pairing, and lie in the center of the ring of autosomes. A desynaptic origin of the univalents is proposed, and the arrangement of the chromosomes in the first and second metaphase plate in the normal and desynaptic individuals is compared and discussed. The meiotic characteristics of these desynaptic individuals are also compared with those described in other insects with holocentric and monocentric chromosomes. It is suggested that any achiasmatic chromosome, whether a univalent, m or sex chromosome, will induce the formation of a ring and with some or all of them lying in its centre. © 1990 Kluwer Academic Publishers. Fil:Papeschi, A.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mola, L.M. 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_v80_n1_p31_Papeschi |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
Male meiosis was studied in a population of Acanonicus hahni (Stål), and nine of the sixteen individuals analyzed showed desynapsis. The frequency of univalents varied from one to seven percent in eight of them, while in the ninth the percentage of cells with univalents was higher (12%). The univalents auto-orientate at metaphase I in the center of the ring formed by autosomal bivalents and divide equationally at anaphase I; at metaphase II they show touch-and-go pairing, and lie in the center of the ring of autosomes. A desynaptic origin of the univalents is proposed, and the arrangement of the chromosomes in the first and second metaphase plate in the normal and desynaptic individuals is compared and discussed. The meiotic characteristics of these desynaptic individuals are also compared with those described in other insects with holocentric and monocentric chromosomes. It is suggested that any achiasmatic chromosome, whether a univalent, m or sex chromosome, will induce the formation of a ring and with some or all of them lying in its centre. © 1990 Kluwer Academic Publishers. |
| format |
JOUR |
| author |
Papeschi, A.G. Mola, L.M. |
| spellingShingle |
Papeschi, A.G. Mola, L.M. Meiotic studies in Acanonicus hahni (Stål) (Coreidae, Heteroptera) I. Behaviour of univalents in desynaptic individuals |
| author_facet |
Papeschi, A.G. Mola, L.M. |
| author_sort |
Papeschi, A.G. |
| title |
Meiotic studies in Acanonicus hahni (Stål) (Coreidae, Heteroptera) I. Behaviour of univalents in desynaptic individuals |
| title_short |
Meiotic studies in Acanonicus hahni (Stål) (Coreidae, Heteroptera) I. Behaviour of univalents in desynaptic individuals |
| title_full |
Meiotic studies in Acanonicus hahni (Stål) (Coreidae, Heteroptera) I. Behaviour of univalents in desynaptic individuals |
| title_fullStr |
Meiotic studies in Acanonicus hahni (Stål) (Coreidae, Heteroptera) I. Behaviour of univalents in desynaptic individuals |
| title_full_unstemmed |
Meiotic studies in Acanonicus hahni (Stål) (Coreidae, Heteroptera) I. Behaviour of univalents in desynaptic individuals |
| title_sort |
meiotic studies in acanonicus hahni (stål) (coreidae, heteroptera) i. behaviour of univalents in desynaptic individuals |
| url |
http://hdl.handle.net/20.500.12110/paper_00166707_v80_n1_p31_Papeschi |
| work_keys_str_mv |
AT papeschiag meioticstudiesinacanonicushahnistalcoreidaeheteropteraibehaviourofunivalentsindesynapticindividuals AT molalm meioticstudiesinacanonicushahnistalcoreidaeheteropteraibehaviourofunivalentsindesynapticindividuals |
| _version_ |
1807314822224674816 |