These studies have shown that the differentiation of sex chromosomes is frequently associated with the accumulation of such DNA sequences on chromosomes Vicente et al. E-mail: rb. The physical mapping of the pPh sequence showed that this satellite DNA is present on chromosomes Z and W also on autosomal chromosomes ; however, it is not a part of the heterochromatic amplified region of the W chromosome heteromorphism Bellafronte et al.
Karyological geographic variation of Oligoryzomys nigripes Olfers, Rodentia, Cricetidae from Brazil.
Methods Cell Sci — Figure 1. Most O. Curr Opin Genet Dev. Apareiodon hasemani and most species of Parodontidae show only one submetacentric pair carrying 5S rDNA sites; however, the cistron is located in the subterminal region of the long arm. A model of karyotypic evolution for Oligoryzomys nigripes We propose a hypothetical evolutionary pattern and radiation scenario for Oligoryzomys based on the hypothesis that the original differentiation area of the oryzomyines was the Andean region of Ecuador, Colombia and Venezuela Savage, ; Reig,
On the other hand, the terminal heterochromatic block in the long arm of the Z and W chromosomes of A. Experientia Send correspondence to Orlando Moreira Filho. This article has been cited by other articles in PMC.
Our data revealed that the heterochromatin of the sex chromosomes of Oligoryzomys nigripes is not related to repetitive telomeric sequences, and thus we believe that they are associated to DNA-protein association. J mol Evol Associate Editor: Yatiyo Yonenaga-Yassuda.
This article has been cited by other articles in PMC.