Variability of the nucleolus organizer regions and the presence of the rDNA genes in the supernumerary chromosome of Akodon aff. arviculoides (Cricetidae, Rodentia)

• Autor(a) principal: Yonenaga-Yassuda, Yatiyo
• Data de Publicação: 1992
• Outros Autores: De Fátima Lima De Assis, Maria, Kasahara, Sanae [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1080/00087114.1992.10797220; http://hdl.handle.net/11449/223834

The distribution of Ag-NORs was analyzed in 25 specimens of Akodon aff. arviculoides (2n = 24 and 25). NORs occurred on chromosome arms 2q, 3p, 6p, 7q and lOq, as identified by successive Ag- and G-band staining. In one specimen with 2n = 25, the supernumerary B chromosome presented Ag-NORs on both arms but in 3 other animals this chromosome was never stained. The number of Ag-NORs per cell ranged from 1 to 10 and the staining pattern was characteristic for each chromosome pair in an individual. No differences between tissues were observed in four animals investigated. © 1992 Taylor & Francis Group, LLC.