Abstract
Consecutive X and Y chromatin survey among 1,581 Japanese juvenile delinquents had been undertaken for three years. Among 1,371 males, five 47,XYY males and four 47,XXY males were found (0.36% and 0.29% respectively), while no numerical abnormalities of X chromatin were found in 210 females. Frequency of 47,XYY males in the present study is significantly higher than that of newborns. With respect to sample size, for which the frequencies of 47,XYY and 47,XXY males have been estimated, a possible bias in the studies reported previously was suggested.
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