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	Provedor de dados Genet. Mol. Biol. (2) BABT (1) Autor Cestari,Marta Margarete (1) Fenocchio,Alberto Sérgio (1) Foresti,Fausto (1) Garcia,Caroline (1) Gomes,Eduardo A. (1) Kantek,Daniel Luis Zanella (1) Moreira Filho,Orlando (1) Noleto,Rafael Bueno (1) Oliveira,Claudio (1) Porto-Foresti,Fábio (1) Rigolino,Marcos G. (1) Tabata,Yara A. (1) Mais... Palavra-chave Paracentric inversion (3) 18S rDNA (1) 5S rDNA (1) Cytogenetics (1) Fish cytogenetics (1) NOR polymorphism (1) Pimelodus (1) Rainbow trout (1) Species marker (1) Triploidy (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Ano 2008 (1) 2007 (1) 2004 (1) País Brazil (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última A lethal effect associated with polymorphism of the NOR-bearing chromosomes in rainbow trout (Oncorhynchus mykiss) Genet. Mol. Biol. Porto-Foresti,Fábio; Oliveira,Claudio; Gomes,Eduardo A.; Tabata,Yara A.; Rigolino,Marcos G.; Foresti,Fausto. Cytogenetic analysis of a rainbow trout stock showed that the nucleolar organizing regions were located subterminally on the long arm of a submetacentric chromosome pair and occurred as a single chromosomal segment (phenotype N1) or as two chromosomal segments separated by a short euchromatic segment (phenotype N2). Cytogenetic analysis also showed that there were N1N1 and N1N2 individuals but no N2N2 individuals. Analysis of the different includedphenotypes incluted that the population was not in Hardy-Weinberg equilibrium (chi² = 19.333; p < 0.01), and that a higher frequency of individuals had the N1N2 phenotype. Experimental crosses involving four males (two N1N1 and two N1N2) and four females (one N1N1 and three N1N2) yielded eight broods. There... Tipo: Info:eu-repo/semantics/article Palavras-chave: NOR polymorphism; Paracentric inversion; Fish cytogenetics; Rainbow trout. Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000100009 Cytotaxonomy, heterochromatic polymorphism and natural triploidy of a species of Astyanax (Pisces, Characidae) endemic to the Iguaçu river basin BABT Kantek,Daniel Luis Zanella; Noleto,Rafael Bueno; Fenocchio,Alberto Sérgio; Cestari,Marta Margarete. Cytogenetic analysis with Astyanax sp. D revealed a karyotype of 2n=50 with 2M+26SM+6ST+16A, besides a triploid specimen showing 2n=75 chromosomes (3M+39SM+9ST+24A). C-banding strongly stained the terminal regions of several SM-ST-A chromossomes. Two pairs of acrocentric chromosomes presented interstitial heterochromatin, this state being polymorphic and occuring due to possible paracentric inversions. The results obtained with the AluI restriction enzyme and A3 chromomycin were similar to the C-banding. Relationships were proposed between Astyanax sp. D and A. scabripinnis, as well as considerations for a possible origin of the triploid specimen (2n=3x=75). When comparing the present results with cytogenetic features of other endemic Astyanax species in... Tipo: Info:eu-repo/semantics/article Palavras-chave: Cytogenetics; Triploidy; Paracentric inversion. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000100008 Localization of ribosomal genes in three Pimelodus species (Siluriformes, Pimelodidae) of the São Francisco River: 5S genes as species markers and conservation of the 18S rDNA sites Genet. Mol. Biol. Garcia,Caroline; Moreira Filho,Orlando. Pimelodidae is one of the most representative of Neotropical catfish families. However, these fish are still poorly studied in terms of cytogenetics, especially regarding the application of more accurate techniques such as the chromosomal localization of ribosomal genes. In the present work, fluorescent in situ hybridization with 5S and 18S rDNA probes was employed for rDNA site mapping in Pimelodus sp., P. fur and P. maculatus from the São Francisco River in the Três Marias municipality - MG. The results from the application of the 18S probe confirmed the previous data obtained by silver nitrate staining, identifying a simple nucleolar organizing region system for these species. However, the labeling results from the 5S rDNA probe demonstrated a... Tipo: Info:eu-repo/semantics/article Palavras-chave: Pimelodus; Paracentric inversion; 5S rDNA; 18S rDNA; Species marker. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200018 Registros recuperados: 3 Primeira ... 1 ... Última

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