PRESENCE OF ABUNDANT HETEROCHROMATIN IN THE KARYOTYPES OF CEBUS - CEBUS-CAPUCINUS AND CEBUS-NIGRIVITTATUS

Abstract

The karyotypes of C. capucinus and C. nigrivittatus (Primates, Platyrrhini) were compared after applying several banding techniques. The chromosomes have abundant intercalary heterochromatin which can be stained by R[reverse]-, C[constitutive heterochromatin]- and T[terminal]-banding techniques and which are late replicating. The X chromosome resembles that of man and of numerous primates. The late replicating pattern of the X in female lymphocytes resembles that of the late replicating X of human fibroblasts rather than of human lymphocytes. Banding patterns of certain chromosomes appear analogous in Cebus and Catarrhini, including man.