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Abstract:

A sample of 27 males of Zoniopoda tarsata from Argentina was studied cytologically. The three largest autosomal pairs and the X were characterized by the presence of interstitial C-bands. Chiasma position relative to the bands was analyzed at diplotene and diakinesis. The frequency of interstitial, terminal and total chiasmata per cell was studied for the whole autosomal bivalent set, analysing the variations between stages and among individuals. The comparison of interstitial chiasma frequencies between stages and among individuals and the study of chiasma position relative to the bands in pairs 1, 2 and 3 indicated that chiasma distribution varied from diplotene to diakinesis. Therefore, terminalization does exist in this species and the movement may occur towards the centromere. The frequency of terminal associations at diplotene showed a high negative correlation (r=-0.89; p<10-5) with the number of interstitial chiasmata. This correlation would not be expected if the two kinds of association were produced by different (independent) mechanisms. Consequently, terminal associations were considered genuine chiasmata. The correlation between interstitial and total chiasmata was very much lower then the former (r=0.39; p=0.04). This fact, besides the relatively low variation for chiasma number, observed among individuals suggests that in this species the number of interestitial chiasmata, which are the most important in controlling the genetical recombination, is mainly regulated by changes in chiasma distribution, while variations in total chiasma frequency are of much lower magnitude. © 1988 Kluwer Academic Publishers.

Registro:

Documento: Artículo
Título:Studies on chiasma distribution and chiasma movement in Zoniopoda tarsata (Orthoptera: Romaleidae)
Autor:Vilardi, J.C.
Filiación:Lab. Genética, Dpto. Cs. Biológicas, Fac. Cienias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, 1428, Argentina
Año:1988
Volumen:76
Número:1
Página de inicio:73
Página de fin:80
DOI: http://dx.doi.org/10.1007/BF00126012
Título revista:Genetica
Título revista abreviado:Genetica
ISSN:00166707
CODEN:GENEA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v76_n1_p73_Vilardi

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Citas:

---------- APA ----------
(1988) . Studies on chiasma distribution and chiasma movement in Zoniopoda tarsata (Orthoptera: Romaleidae). Genetica, 76(1), 73-80.
http://dx.doi.org/10.1007/BF00126012
---------- CHICAGO ----------
Vilardi, J.C. "Studies on chiasma distribution and chiasma movement in Zoniopoda tarsata (Orthoptera: Romaleidae)" . Genetica 76, no. 1 (1988) : 73-80.
http://dx.doi.org/10.1007/BF00126012
---------- MLA ----------
Vilardi, J.C. "Studies on chiasma distribution and chiasma movement in Zoniopoda tarsata (Orthoptera: Romaleidae)" . Genetica, vol. 76, no. 1, 1988, pp. 73-80.
http://dx.doi.org/10.1007/BF00126012
---------- VANCOUVER ----------
Vilardi, J.C. Studies on chiasma distribution and chiasma movement in Zoniopoda tarsata (Orthoptera: Romaleidae). Genetica. 1988;76(1):73-80.
http://dx.doi.org/10.1007/BF00126012