dc.contributorUniv Fed Mato Grosso
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:52:14Z
dc.date.accessioned2022-10-05T14:26:46Z
dc.date.available2014-05-20T13:52:14Z
dc.date.available2022-10-05T14:26:46Z
dc.date.created2014-05-20T13:52:14Z
dc.date.issued2008-06-01
dc.identifierGenetica. Dordrecht: Springer, v. 133, n. 2, p. 109-112, 2008.
dc.identifier0016-6707
dc.identifierhttp://hdl.handle.net/11449/18667
dc.identifier10.1007/s10709-007-9194-x
dc.identifierWOS:000256313400001
dc.identifier8858800699425352
dc.identifier0000-0003-3534-974X
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/3892968
dc.description.abstractThe karyotypic and chromosomal characteristics of the hatchetfish Thoracocharax stellatus from the Araguaia River, Brazil (Araguaia-Tocantins basin) were analyzed using Giemsa, AgNO3, and CMA(3) fluorescent staining, and C-banding. The diploid chromosome number was 54 and the karyotypes of females and males were composed of six metacentrics, six submetacentrics, six subtelocentrics and 36 acrocentrics. Two impaired acrocentric chromosomes were detected in the female karyotype. C-banding showed heterochromatic blocks at several chromosomes and an entirely heterochromatic acrocentric chromosome in females that was lacking in the male karyotype. This discovery indicated a heteromorphic sex chromosome system of the ZZ/ZW type. Ag-staining and CMA(3) fluorescence revealed one major chromosome pair bearing the NORs with the presence of additional signals in some metaphases. Both heterochromatic segments associated with Ag-NORs and the W chromosome were positively stained by CMA(3). Considering the present data and previous findings it is hypothesized that the occurrence of ZW sex chromosome system is widespread in the genus Thoracocharax.
dc.languageeng
dc.publisherSpringer
dc.relationGenetica
dc.relation1.366
dc.relation0,649
dc.rightsAcesso restrito
dc.sourceWeb of Science
dc.subjectfish cytogenetics
dc.subjectchromosome banding
dc.subjectheteromorphic sex chromosomes
dc.subjecthatchetfish
dc.titleOccurrence of ZZ/ZW sex chromosomes in Thoracocharax stellatus fish (Characiformes, Gasteropelecidae) from the Araguaia River, south America
dc.typeArtigo


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