SciELO - Scientific Electronic Library Online

 
vol.23 issue1Loss of genetic variability at the transferrin locus in five hatchery stocks of tambaqui (Colossoma macropomum)Mapping 18S ribosomal genes in fish of the genus Brycon (Characidae) by fluorescence in situ hybridization (FISH) author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Genetics and Molecular Biology

Print version ISSN 1415-4757

Abstract

LOURENCO, Luciana Bolsoni; RECCO-PIMENTEL, Shirlei M.  and  CARDOSO, Adão José. A second case of multivalent meiotic configurations in diploid species of Anura. Genet. Mol. Biol. [online]. 2000, vol.23, n.1, pp. 131-133. ISSN 1415-4757.  http://dx.doi.org/10.1590/S1415-47572000000100024.

We analyzed the meiotic chromosomes of specimens from the two karyological groups of Physalaemus petersi (Jiménez de la Espada, 1872) described in the literature. Multivalent configurations (rings or chains) were observed in both groups. This meiotic organization resulted from the terminal association of non-homologous chromosomes, and an analysis of C-banded multivalents indicated no involvement of heterochromatic regions in these associations. A possible explanation for such meiotic configurations is the occurrence of heterozygous translocations. Thus, multivalents may indicate the involvement of translocation events in the karyotypic evolution of P. petersi.

        · abstract in Portuguese     · text in English     · pdf in English