Chromosome Study of a Marmoset Hybrid

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Abstract
The mating of a Sagulnus oedipus male with a S. midas female produced a set of viable fraternal twins, of which the male was the subject of this study. The female co-twin died prior to this investigation. Although the karyotype of the male hybrid monkey was similar in both parents, cytological and histological studies of its testes demonstrated only meiotic arrest and the animal was presumed to be sterile. Various mechanisms of hybrid sterility are discussed.