Karyotypic study of a population sample of twenty-one owl monkeys, Aotus, originating from Bolivia, revealed two sex-specific somatic diploid chromosome numbers: 49 for males and 50 for females. The presence of a trivalent in male meiotic figures and the identification of chromosomes by band pattern analysis confirmed the interpretation of a Y-autosome translocation in the males.
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F. et al. (1976) studied this question.
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