Comparative cytogenetic studies in Macaca arctoides with other species of Macaca and man

Chromosome studies of 5 males and 5 females of the species Macaca arctoides from Thailand were performed and the G, C and NOR banding patterns obtained for comparison with other species of the genus Macaca and with the human karyotype. The cytogenetic analysis showed a complement of 42 chromosomes. Of the 20 autosomal pairs, 15 are submetacentric and 5 almost metacentric. Pair number 9 presents a large secondary constriction, which corresponds to the only nucleolar organizer region of the whole genome, and has giant satellites in the short arms. In regard to the sex chromosomes, females have a pair of submetacentric chromosomes with a G banding pattern identical to that of the human X, while the males have one X and a very small Y chromosome.