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Abstract:

Cytogenetic analysis of different populations of Belostoma plebejum (2n = 14 + XY, male) has revealed the presence of two naturally occurring chromosome mutants: one heterozygous for an autosomal fusion, and the other with a sex chromosome fragmentation. Meiosis in both individuals is very regular. The fusion heterozygote (2n = 13 + XY) presented an autosomal trivalent at meiosis I, which divided reductionally at first anaphase; cells at meiosis II had 6 or 7 autosomes plus the XY pseudo-bivalent. The other chromosome mutant presented three sex chromosomes, which probably resulted from the fragmentation of the original X chromosome (2n = 14 + X1X2Y). The three sex chromosomes divided equationally at anaphase I and associated in a chain at metaphase II. Many authors are of the opinion that karyotype evolution in Heteroptera has proceeded principally by fusions and fragmentations. Particularly in Belostoma, it has been proposed that evolution from the ancestral number 2n = 26 + XY has occurred through autosomal fusions and an X chromosome fragmentation. The facts that these rearrangements have been found in natural populations of B. plebejum and that they show a regular meiotic behaviour, seem to support the suggested hypothesis. © 1994 Taylor & Francis Group, LLC.

Registro:

Documento: Artículo
Título:Chromosome rearrangements in Belostoma plebejum (Stål) (Belostomatidae, Heteroptera)
Autor:Papeschi, A.G.
Filiación:Laboratorio de Genética, Departamento Ciencias Biológicas, Universidad de Buenos Aires, Buenos Aires, 1428, Argentina
Palabras clave:Belostoma; Fragmentation carrier; Fusion heterozygote; Holokinetic
Año:1994
Volumen:47
Número:3-4
Página de inicio:223
Página de fin:231
DOI: http://dx.doi.org/10.1080/00087114.1994.10797300
Título revista:Caryologia
Título revista abreviado:Caryologia
ISSN:00087114
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00087114_v47_n3-4_p223_Papeschi

Referencias:

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Citas:

---------- APA ----------
(1994) . Chromosome rearrangements in Belostoma plebejum (Stål) (Belostomatidae, Heteroptera). Caryologia, 47(3-4), 223-231.
http://dx.doi.org/10.1080/00087114.1994.10797300
---------- CHICAGO ----------
Papeschi, A.G. "Chromosome rearrangements in Belostoma plebejum (Stål) (Belostomatidae, Heteroptera)" . Caryologia 47, no. 3-4 (1994) : 223-231.
http://dx.doi.org/10.1080/00087114.1994.10797300
---------- MLA ----------
Papeschi, A.G. "Chromosome rearrangements in Belostoma plebejum (Stål) (Belostomatidae, Heteroptera)" . Caryologia, vol. 47, no. 3-4, 1994, pp. 223-231.
http://dx.doi.org/10.1080/00087114.1994.10797300
---------- VANCOUVER ----------
Papeschi, A.G. Chromosome rearrangements in Belostoma plebejum (Stål) (Belostomatidae, Heteroptera). Caryologia. 1994;47(3-4):223-231.
http://dx.doi.org/10.1080/00087114.1994.10797300