Licence: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Credit: Counseling in medical genetics / Sheldon Reed. Source: Wellcome Collection.
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![The Physician Discovers the Chromosomes / 37 if -1 M li ill 'II i Fig. 2. The chromosome complement of a normal male, 46 XY. The double-Y (47,XYY) male is the most interesting of all the chromosome anomalies to the general public. His is the most frequent of the chromosome aberrations — 1 in 250 newborn males, or about 850,000 cases in the U.S. [Stine, 1977, p 153]. Like the 47,XXX anomaly, he is usually fertile and generally indis¬ tinguishable in the general population. The public is interested in the double-Y male because of the association between this karyotype and some kind of mental difference that results in a somewhat higher rate of commitment to correctional institutions. The double-Y male tends to be taller than the average male, but this characteristic does not seem to contribute to the social defect. Christensen and Nielsen [1973] studied 10 institutionalized XYY males and found their IQ values to be normally distributed, while the pattern of psychological deviations did not resemble that of any other known anomaly. Their difficulties in social adjustment may start in childhood with various kinds of irresponsible behavior. The double-Y condition brings up an important legal problem as to whether such a person is responsible for his behavior. If the double-Y male has murdered b-..](https://iiif.wellcomecollection.org/image/b18037161_0051.JP2/full/800%2C/0/default.jpg)
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