%0 Journal Article
%T Intra-individual numerical chromosomal polymorphism in Trichomycterus davisi (Siluriformes, Trichomycteridae) from the Igua£¿u River basin in Brazil
%A Borin
%A Luciana Andreia
%A Martins-Santos
%A Isabel Cristina
%J Genetics and Molecular Biology
%D 2000
%I Sociedade Brasileira de Gen¨¦tica
%R 10.1590/S1415-47572000000300018
%X cytogenetic analysis of trichomycterus davisi, collected from the igua£¿u river basin, has shown a diploid number of 2n = 54 chromosomes. however, we observed intra-individual numerical polymorphism in a t. davisi specimen. there were three cell populations with diploid number 2n = 54 (40m + 12sm + 2st), 2n = 55 (40m + 12sm + 2st + 1m) and 2n = 56 (40m + 12sm + 2st + 2a) chromosomes. this variation was attributed to a probable post-zygotic non-disjunction of a metacentric chromosome of small/middle size, followed by centric fission, which originated in this individual.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1415-47572000000300018&lng=en&nrm=iso&tlng=en