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An infant with ambiguous genitalia, uterus, tubes, and bilaterally undescended testes was found to have an unstable dicentric Yq chromosome, and 45,X/46,X,dic i(Yq)/47,X,i(Yq) i(Yq) mosaicism in lymphocytes and fibroblasts. A few other minor cell lines were found in peripheral blood lymphocytes. These findings indicate a high degree of mitotic instability in the centromere of the dicentric i(Yq) chromosome in this patient.

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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