Studies of the squirrel monkey, Saimiri sciureus, genome. I. Cytological characterization of chromosomal heterozygosity.

Chromosomal banding analyses have revealed two nonhomologous pericentric inversions in the telocentric group of chromosomes of a squirrel monkey, Saimiri sciureus. This individual is probably an intersubspecific hybrid whose parents originated from different geographical locations. The C-banding pattern shows polymorphism in location and amount of constitutive heterochromatin in at least four pairs of chromosomes. Ammoniacal silver (Ag-AS) staining specific for locating the nucleolar organizers indicates that these are located on only one pair of chromosomes and that there is a difference in the size of the nucleolus organizer regions between the homologs of this pair.