How have studies indicated that Super Male Syndrome (XYY) causes aggression?
Answer Tanya, Trisomy of single chromosomes, such as in XYY syndrome, is caused by a non-disjunction event during cell division in which the chromosomes do not separate so that only one goes to each daughter cell. This can happen during mitosis or meiosis, but in the case of a genetic condition that is passed to offspring, it happens during meiosis in the gametes. Try this link, and scroll down to Figure 5 for a diagram of nondisjunction during meiosis: http://www.knowledgene.com/public/view.php3?db=gene_school&uid=62 XYY syndrome, also called Jacob syndrome is NOT a “super male syndrome”. This is a misconception in the public caused by a report in the 1960’s concerning prison inmates that implied that XYY males were taller and produced more testosterone (although they did not measure this) and were more violent; however, this study has since been dismissed by the scientific community because the study had too much “ascertainment bias”– this means that the study was flawed because the
