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dc.contributor.authorSilva, M. R. da-
dc.contributor.authorMatoso, D. A.-
dc.contributor.authorVicari, Marcelo Ricardo-
dc.contributor.authorAlmeida, Mara Cristina de-
dc.contributor.authorMargarido, Vladimir Pavan-
dc.contributor.authorArtoni, Roberto Ferreira-
dc.date.accessioned2020-06-15T21:51:57Z-
dc.date.available2020-06-15T21:51:57Z-
dc.date.issued2011-
dc.identifier.urihttps://repositorio.inpa.gov.br/handle/1/18136-
dc.description.abstractNeotropical 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.isoenpt_BR
dc.relation.ispartofVolume 135, Número 2, Pags. 143-149pt_BR
dc.rightsRestrito*
dc.subjectRepetitive Dnaen
dc.subjectAnimals Tissueen
dc.subjectChromosome Analysisen
dc.subjectDna Determinationen
dc.subjectFemaleen
dc.subjectGymnotiformesen
dc.subjectGymnotus Pantanalen
dc.subjectHeterochromatinen
dc.subjectMaleen
dc.subjectMeiosisen
dc.subjectMetaphase Chromosomeen
dc.subjectNonhumanen
dc.subjectPriority Journalen
dc.subjectSex Chromosomeen
dc.subjectAnimalen
dc.subjectBase Sequenceen
dc.subjectChromosome Bandingen
dc.subjectFemaleen
dc.subjectGymnotiformesen
dc.subjectIn Situ Hybridization, Fluorescenceen
dc.subjectKaryotypeen
dc.subjectKaryotypingen
dc.subjectMaleen
dc.subjectMeiosisen
dc.subjectMolecular Sequence Dataen
dc.subjectPachytene Stageen
dc.subjectRepetitive Sequences, Nucleic Aciden
dc.subjectSequence Analysis, Dnaen
dc.subjectSex Chromosomesen
dc.subjectGymnotidaeen
dc.subjectGymnotiformesen
dc.subjectGymnotusen
dc.subjectPiscesen
dc.titleRepetitive DNA and meiotic behavior of sex chromosomes in Gymnotus pantanal (Gymnotiformes, Gymnotidae)en
dc.typeArtigopt_BR
dc.identifier.doi10.1159/000330777-
dc.publisher.journalCytogenetic and Genome Researchpt_BR
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