Constitutive heterochromatin, G-bands and nucleolus-organizer regions in four species of Didelphidae (Marsupialia)


Autoria(s): Yononaga-Yassuda, Y.; Kasahara, S.; Souza, M. J.; L'Abbate, M.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

26/05/2014

26/05/2014

01/02/1982

Resumo

Chromosomes of Didelphis albiventris, D. marsupialis, Philander opossum and Lutreolina crassicaudata, four species of marsupials with very similar karyotypes and 2n=22 were studied. All the chromosomes were acrocentrics except the X in L. crassicaudata, which is a metacentric. The G-band patterns of these species are similar but the distribution of constitutive heterochromatin differs among them as shown by C-banding. The hypothesis that the X in L. crassicaudata might be an isochromosome derived from the acrocentric X in the other species is discarded since G-and C-banding patterns differ in the two arms. In D. marsupialis the Ag-NORs are terminal and located in both arms of one pair and in the long arms of two pairs of medium-sized autosomes. In P. opossum the NOR-bearing chromosomes could be precisely identified through simultaneous silver staining and G-banding. The Ag-NORs are terminal and located at the short arm of pair 5 and the long arm of pair 7. © 1982 Dr W. Junk Publishers.

Formato

71-77

Identificador

http://dx.doi.org/10.1007/BF00056006

Genetica, v. 58, n. 1, p. 71-77, 1982.

0016-6707

1573-6857

http://hdl.handle.net/11449/63563

10.1007/BF00056006

2-s2.0-0002767097

Idioma(s)

eng

Relação

Genetica

Direitos

closedAccess

Tipo

info:eu-repo/semantics/article