%0 Journal Article
%T A second case of multivalent meiotic configurations in diploid species of Anura
%A Louren£¿o
%A Luciana Bolsoni
%A Recco-Pimentel
%A Shirlei M.
%A Cardoso
%A Ad£¿o Jos¨¦
%J Genetics and Molecular Biology
%D 2000
%I Sociedade Brasileira de Gen¨¦tica
%R 10.1590/S1415-47572000000100024
%X we analyzed the meiotic chromosomes of specimens from the two karyological groups of physalaemus petersi (jim¨¦nez 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.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1415-47572000000100024&lng=en&nrm=iso&tlng=en