Abstract
The presence of shared chromosomes in Akodont rodents was analysed by comparing the distribution of G-bands (such as produced by mild trypsin digestion of chromosomes) in the karyotypes from three species: Akodon molinae, Akodon azarae and Akodon obscures. Results obtained showed that: a) 11 chromosome pairs have the same G-banding patterns in the three species (shared chromosomes), b) 5 pairs showed similar G-band distribution in at least two of the three species (shared chromosomes), c) 7 pairs in A. molinae, 3 pairs in A. azarae and 3 pairs in A. obscurus exhibited banding patterns not shared by the other species (non-shared chromosomes).
The variability of G-banding patterns in the proximal third of pair 1, X and Y chromosomes suggest that these chromosomes (or chromosome regions) are unstable and prone to undergo evolutionary rearrangements.
