Abstract
Cytogenetics of 5 macaque species from genus Macaca in Thailand were studied using lymphocyte cultures and high-resolution techniques. Their chromosome numbers are 2n=42, 20 pairs of autosome, and 1 pair of sex-chromosome. M. arctoides and M. mulatta have a fundamental number (NF) 84 in male and female but the others have 83 in male and 84 in female. They have 6 large, 4 medium, 8 small metacentric chromosomes and 8 large, 12 medium, 2 small submetacentric chromosomes respectively. M. fascicularis and M. mulatta have medium metacentric X chromosome. M. assamensis, M. nemestrina and M. arctoides have medium submetacentric X chromosome. M. arctoides has small submetacentric Y chromosomes, M. mulatta has small metacentric Y chromosomes, while M. assamensis, M. fascicularis and M. nemestrina have small telocentric Y chromosomes. By using G-banding in metaphase and high-resolution technique in late prophase, the results show that the bands are 274, 273, 273, 275, 273 and 351, 350, 350, 352, 350 respectively. Their autosome and X chromosome are similar but their Y chromosome is different. The NOR is on the short arm of chromosome 13. The largest is the metacentric chromosome. The smallest is theY chromosome. Thus X and Y chromosomes can use for identification.
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