Fig. 2.

Satellite probe hybridizes to centromeres of all species of Peromyscus but varies at telomeric locations. A fluorescent probe was prepared and hybridized to metaphase spreads, and the genomic distribution of the satellite on each chromosome was recorded in each species. A representative FISH image is shown for each species (DAPI-stained chromosomes are gray, and probe signal is red), and the results are summarized in the ideogram. No hybridization was observed in C. griseus. Green-shaded chromosomes represent those that have diverged from the ancestral karyotype (shown at the base of the tree, centromeres are denoted by black-filled areas), indicating that it has experienced interspecific rearrangement. Asterisks denote chromosomes known to exist in polymorphic forms within an individual of the respective species. Phylogenetic relationships among species shown to the left and based on Bradley et al. (2007)