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Campo DC | Valor | Idioma |
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dc.contributor.author | Silva, M. R. da | - |
dc.contributor.author | Matoso, D. A. | - |
dc.contributor.author | Vicari, Marcelo Ricardo | - |
dc.contributor.author | Almeida, Mara Cristina de | - |
dc.contributor.author | Margarido, Vladimir Pavan | - |
dc.contributor.author | Artoni, Roberto Ferreira | - |
dc.date.accessioned | 2020-06-15T21:51:57Z | - |
dc.date.available | 2020-06-15T21:51:57Z | - |
dc.date.issued | 2011 | - |
dc.identifier.uri | https://repositorio.inpa.gov.br/handle/1/18136 | - |
dc.description.abstract | Neotropical fishes have a low rate of chromosome differentiation between sexes. The present study characterizes the first meiotic analysis of sex chromosomes in the order Gymnotiformes. Gymnotus pantanal - females had 40 chromosomes (14m/sm, 26st/a) and males had 39 chromosomes (15m/sm, 24st/a), with a fundamental number of 54 - showed a multiple sexual determination chromosome system of the type X 1X 1X 2X 2/X 1X 2Y. The heterochromatin is restricted to centromeres of all chromosomes of the karyotype. The meiotic behavior of sex chromosomes involved in this system in males is from a trivalent totally pared in the pachytene stage, with a high degree of similarity. The cells of metaphase II exhibit 19 and 20 chromosomes, normal disjunction of sex chromosomes and the formation of balanced gametes with 18 + Y and 18 + X 1X 2 chromosomes, respectively. The small amount of heterochromatin and repetitive DNA involved in this system and the high degree of chromosome similarity indicated a recent origin of the X 1X 1X 2X 2/X 1X 2Y system in G. pantanal and suggests the existence of a simple ancestral system with morphologically undifferentiated chromosomes. Copyright © 2011 S. Karger AG. | en |
dc.language.iso | en | pt_BR |
dc.relation.ispartof | Volume 135, Número 2, Pags. 143-149 | pt_BR |
dc.rights | Restrito | * |
dc.subject | Repetitive Dna | en |
dc.subject | Animals Tissue | en |
dc.subject | Chromosome Analysis | en |
dc.subject | Dna Determination | en |
dc.subject | Female | en |
dc.subject | Gymnotiformes | en |
dc.subject | Gymnotus Pantanal | en |
dc.subject | Heterochromatin | en |
dc.subject | Male | en |
dc.subject | Meiosis | en |
dc.subject | Metaphase Chromosome | en |
dc.subject | Nonhuman | en |
dc.subject | Priority Journal | en |
dc.subject | Sex Chromosome | en |
dc.subject | Animal | en |
dc.subject | Base Sequence | en |
dc.subject | Chromosome Banding | en |
dc.subject | Female | en |
dc.subject | Gymnotiformes | en |
dc.subject | In Situ Hybridization, Fluorescence | en |
dc.subject | Karyotype | en |
dc.subject | Karyotyping | en |
dc.subject | Male | en |
dc.subject | Meiosis | en |
dc.subject | Molecular Sequence Data | en |
dc.subject | Pachytene Stage | en |
dc.subject | Repetitive Sequences, Nucleic Acid | en |
dc.subject | Sequence Analysis, Dna | en |
dc.subject | Sex Chromosomes | en |
dc.subject | Gymnotidae | en |
dc.subject | Gymnotiformes | en |
dc.subject | Gymnotus | en |
dc.subject | Pisces | en |
dc.title | Repetitive DNA and meiotic behavior of sex chromosomes in Gymnotus pantanal (Gymnotiformes, Gymnotidae) | en |
dc.type | Artigo | pt_BR |
dc.identifier.doi | 10.1159/000330777 | - |
dc.publisher.journal | Cytogenetic and Genome Research | pt_BR |
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