Unusual occurrence of a ZZ/ZW sex-chromosome system and supernumerary chromosomes in Characidium cf. fasciatum (Pisces, Characiformes, Characidiinae)

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorMaistro, E. L.
dc.creatorMata, E. P.
dc.creatorOliveira, C.
dc.creatorForesti, F.
dc.date2014-05-20T13:51:26Z
dc.date2016-10-25T17:03:00Z
dc.date2014-05-20T13:51:26Z
dc.date2016-10-25T17:03:00Z
dc.date1998-01-01
dc.date.accessioned2017-04-05T21:05:13Z
dc.date.available2017-04-05T21:05:13Z
dc.identifierGenetica. Dordrecht: Kluwer Academic Publ, v. 104, n. 1, p. 1-7, 1998.
dc.identifier0016-6707
dc.identifierhttp://hdl.handle.net/11449/18386
dc.identifierhttp://acervodigital.unesp.br/handle/11449/18386
dc.identifier10.1023/A:1003242020259
dc.identifierWOS:000078313400001
dc.identifierhttp://dx.doi.org/10.1023/A:1003242020259
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/864572
dc.descriptionIndividuals of two populations of the fish Characidium cf. fasciatum were cytogenetically studied and showed a basic diploid number of 50 chromosomes. Some fishes were found to have 51 to 54 chromosomes due to the presence of one to four small subtelocentric/acrocentric supernumerary chromosomes. When analyzed by conventional Giemsa staining, male and female specimens of C. cf. fasciatum from the Quinta stream and Pardo River presented the same basic karyotypic macro- and microstructure, consisting of 32 metacentric and 18 submetacentric chromosomes.Ag-NORs were terminally located on the long arms of two submetacentric chromosome pairs. Constitutive heterochromatin was identified by C-banding as small pericentromeric blocks in the majority of the chromosomes, and B-chromosomes were found to be heterochromatic. The occurrence of one totally heterochromatic submetacentric chromosome restricted to females and considered as an unusual feature in fish karyotypes led to the identification of a ZZ/ZW sex-chromosome system. The implications of chromosomic differentiation observed in the genus Characidium are discussed.
dc.languageeng
dc.publisherKluwer Academic Publ
dc.relationGenetica
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectB-chromosomes
dc.subjectCharacidium
dc.subjectfish cytogenetics
dc.subjectZZ/ZW sex-chromosome system
dc.titleUnusual occurrence of a ZZ/ZW sex-chromosome system and supernumerary chromosomes in Characidium cf. fasciatum (Pisces, Characiformes, Characidiinae)
dc.typeOtro


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