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A population of Belostoma sp. polymorphic for the sex chromosome determining system has been analyzed. The fundamental karyotype of the species is 2n = 16 = 14 + XY (male), and at different times individuals 2n = 17 have been encountered in a low frequency (27% and 16%, respectively). Sex chromosome area measurements confirm that the original X chromosome of the XY system has fragmented into two unequal-sized chromosomes (X1 and X2). At male metaphase II, the sex univalents associate in a pseudotrivalent that can show different arrangements (in a chain, in a double-plate, or in other transitional arrangements). Their frequency varies among individuals. The present polymorphic population represents a direct evidence of a multiple sex chromosome system originating through fragmentation of the single X. The different kinds of arrangement of the three sex chromosomes at male metaphase II, and their frequency within each individual suggest that some forces are acting to achieve a double plate arrangement and a regular meiotic behaviour. The maintenance of the polymorphism during more than three years seems to indicate that the new chromosomal variant is neutral, or even could be selectively advantageous.


Documento: Artículo
Título:Sex chromosome polymorphism in a species of Belostoma (Belostomatidae, Heteroptera)
Autor:Papeschi, A.G.
Filiación:Lab. de Genética, Depto. de Cs. Biológicas, Pab. II. Ciudad Universitaria, 1428. Buenos Aires, Argentina
Genética, Depto. de Cs. Biológicas, Ciudad Universitaria, 1428. Buenos Aires, Argentina
Palabras clave:animal cell; article; chromosome polymorphism; chromosome variant; female; Hemiptera; karyotype; male; metaphase chromosome; nonhuman; sex chromosome; species; X chromosome; Y chromosome; Animalia; Belostoma; Belostomatidae; Hemiptera; Heteroptera
Página de inicio:269
Página de fin:274
Título revista:Hereditas
Título revista abreviado:HEREDITAS


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---------- APA ----------
(1996) . Sex chromosome polymorphism in a species of Belostoma (Belostomatidae, Heteroptera). Hereditas, 124(3), 269-274.
---------- CHICAGO ----------
Papeschi, A.G. "Sex chromosome polymorphism in a species of Belostoma (Belostomatidae, Heteroptera)" . Hereditas 124, no. 3 (1996) : 269-274.
---------- MLA ----------
Papeschi, A.G. "Sex chromosome polymorphism in a species of Belostoma (Belostomatidae, Heteroptera)" . Hereditas, vol. 124, no. 3, 1996, pp. 269-274.
---------- VANCOUVER ----------
Papeschi, A.G. Sex chromosome polymorphism in a species of Belostoma (Belostomatidae, Heteroptera). HEREDITAS. 1996;124(3):269-274.