XYY syndrome

(redirected from Jacobs syndrome)
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XYY syndrome

the theory that a man with an extra Y-chromosome is predisposed towards violence and aggression and hence the basis, usually unsuccessful, for a defence argument.
References in periodicals archive ?
It is the first non-invasive prenatal test that offers the option to include evaluation of sex chromosome aneuploidies, such as Turner syndrome (Monosomy X), Triple X (XXX), Klinefelter syndrome (XXY) and Jacobs syndrome (XYY) - the most common fetal sex chromosome abnormalities.