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	Provedor de dados Genet. Mol. Biol. (1) Neotropical Ichthyology (1) Autor Foresti,Fausto (2) Oliveira,Claudio (2) Shimabukuro-Dias,Cristiane Kioko (2) Cruz,Vanessa Paes da (1) Palavra-chave NOR (2) C-band (1) C-banding (1) Cytogenetic (1) Fish (1) Fish cytogenetic (1) Karyotype (1) Karyotypic evolution (1) Stingrays (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2011 (1) 2004 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Cytogenetic analysis of five species of the subfamily Corydoradinae (Teleostei: Siluriformes: Callichthyidae) Genet. Mol. Biol. Shimabukuro-Dias,Cristiane Kioko; Oliveira,Claudio; Foresti,Fausto. In the present study, five callichthyid species belonging to the subfamily Corydoradinae were karyotyped: three species of Aspidoras and two of Corydoras. The three species of Aspidoras had the same diploid number, 2n = 46 chromosomes, similar karyotypic formulae, with most chromosomes metacentric or submetacentric, single interstitial Ag-NORs and C-band positive segments mainly found in the centromeric position. The comparative analysis of cytogenetic data available for the genus Aspidoras and other species of Corydoradinae suggest that several events of centric fusion occurred in the origin of the species of Aspidoras. The two analyzed species of Corydoras showed high diploid numbers, 2n = 74 in C. sodalis and 2n = 90 in C. britskii. While C. sodalis... Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish cytogenetic; Karyotype; NOR; C-banding; Karyotypic evolution. Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000400014 Karyotype description and evidence of multiple sex chromosome system X1X1X2X2/X1X2Y in Potamotrygon aff. motoro and P. falkneri (Chondrichthyes: Potamotrygonidae) in the upper Paraná River basin, Brazil Neotropical Ichthyology Cruz,Vanessa Paes da; Shimabukuro-Dias,Cristiane Kioko; Oliveira,Claudio; Foresti,Fausto. Cytogenetic analysis of Potamotrygon aff. motoro and P. falkneri indicated the occurrence of an X1X1X2X2/X1X2 Y multiple sex chromosome system in both species, with 2n = 66 chromosomes for females and 2n = 65 chromosomes for males. The nucleolus organizer regions (NORs) identified using Ag-NOR technique showed that both species have multiple Ag-NORs (5 to 7 chromosomes stained). C-banding technique indicated the presence of heterochromatic blocks in the centromeric regions of almost all chromosomes in both species. Through this study there was evidence of heterogeneity in the karyotypes, which suggests that chromosomal rearrangements such as inversions and/or translocations occurred during the chromosomal evolution in two species of this genus. Tipo: Info:eu-repo/semantics/article Palavras-chave: Cytogenetic; NOR; C-band; Fish; Stingrays. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100020 Registros recuperados: 2 Primeira ... 1 ... Última

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