In 84 male criminals without obvious psychiatric problems, the Y chromosomes were measured and compared with Y chromosomes of 38 staff men of a psychiatric hospital. There were significantly (P < 0.025) more long Y chromosomes in prisoners than in controls. Both the fluorescent and non‐fluorescent segment of Y were involved in the increase. No case of XYY or Y chromosome with atypical structure was found.
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Soudek et al. (1974) studied this question.
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