Publicação:
Chromosome Studies in Hypoptopomatinae (Pisces, Siluriformes, Loricariidae): L. XX/XY Sex Chromosome Heteromorphism in Pseudotocinclus tietensis

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dc.contributor.authorAndreata, Artur Antonio
dc.contributor.authorDe Almeida-Toledo, Lurdes Foresti
dc.contributor.authorDe Almeida, Silvio
dc.contributor.authorFilho, Toledo
dc.contributor.authorOliveira, Claudio
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2022-04-29T08:41:45Z
dc.date.available2022-04-29T08:41:45Z
dc.date.issued1992-01-01
dc.description.abstractThe cytogenetic analysis of 13 specimens (9 males and 4 females) of Pseudotocinclus tietensis showed that this species has 2n=54 chromosomes (26M+20SM+6ST) plus one heteromorphic pair (SM/M) in the males and one homomorphic pair (SM/SM) in the females. Ag-NORs are located interstitially on the long arm of the largest metacentric pair and a small amount of constitutive heterochromatin is present in the karyotypes. The occurrence of a heteromorphic pair in the males is demonstrable by the presence of one extra C-banded block in the Y chromosome. The presence of one heterochromatin block distinguishing the sexual chromosomes suggests that this species presents a very primitive mechanism of sex chromosome differentiation. © 1992, Japan Mendel Society, International Society of Cytology. All rights reserved.en
dc.description.affiliationDepartamento de Biologia Instituto de Biociencias USP, Sao Paulo, Caixa Postal 11.461, 05499, Säo Paulo, SP
dc.description.affiliationDepartamento de Morfologia Instituto de Biociencias, UNESP, Campus de Botucatu
dc.format.extent369-372
dc.identifierhttp://dx.doi.org/10.1508/cytologia.57.369
dc.identifier.citationCytologia, v. 57, n. 3, p. 369-372, 1992.
dc.identifier.doi10.1508/cytologia.57.369
dc.identifier.issn0011-4545
dc.identifier.scopus2-s2.0-0000326443
dc.identifier.urihttp://hdl.handle.net/11449/230704
dc.language.isoeng
dc.relation.ispartofCytologia
dc.sourceScopus
dc.subjectC-band
dc.subjectKaryotype
dc.subjectNOR
dc.subjectPseudotocinclus
dc.subjectXX/XY sex chromosomes
dc.titleChromosome Studies in Hypoptopomatinae (Pisces, Siluriformes, Loricariidae): L. XX/XY Sex Chromosome Heteromorphism in Pseudotocinclus tietensisen
dc.typeArtigo
dspace.entity.typePublication
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt
unesp.departmentMorfologia - IBBpt

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