XYY Guide, Meaning , Facts, Information and Description
XYY, or "XYY Syndrome," is a trisomy in which a human male receives an extra Y chromosome. The incidence of this condition is about one in 1000 males. Other than being slightly taller and having more severe acne than normal, XYY males are not significantly different from XY males. There are reports that XYY men may be more likely to have behavior problems, possibly due to a higher testosterone level, but these are usually avoided if the syndrome is detected early. There are also reports of learning difficulties, but they may be caused by the behavior problems.
An earlier study suggested that XYY males were more likely to be incarcerated and be criminal, but the study is now widely considered as procedurally flawed. Since there are no distinct physical characteristics, the condition usually is only detected during genetic analysis for other reasons.
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