Constitutive heterochromatin, G-bands and nucleolus-organizer regions in four species of Didelphidae (Marsupialia)
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
26/05/2014
26/05/2014
01/02/1982
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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 |