Criminal Behavior: The Twin Study

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A criminal is an individual who is convicted of a crime and depending upon its severity, faces appropriate consequences. A criminal can exhibit a range of different behaviours and personalities; however, what is common among all violent criminals is that they are extremely aggressive and impulsive. Also, violent criminals often suffer from mental disorders such as psychopathy and antisocial disorder. Before individuals are capable of committing a violent crime they must first acquire certain aggressive behaviours or antisocial personalities that facilitate criminal behaviour. For example violent homicides, committed by psychopathic killers who do not feel any remorse or guilt. For decades it was believed that individuals that commit crimes,
Additionally, violent criminal behaviour is inherent in parents of criminals (Lyons 2007). The twin study is a study of a group of identical twins, which had either both or a single parent with a criminal background or record (Kendler et al. 2014). Each identical twin within a pair were adopted and raised in different households since birth (Kendler et al. 2014). The study of twins allowed the researcher to distinguish which behaviours are the cause of nurture (upbringing) and what are the result of nature (genetic makeup) (Connolly & Beaver 2013; Lyons 2007). The sets of twins were assessed for similarities and differences among their behaviours (Kendler et al. 2014). The results revealed that despite the up bringing in separate households the twins possessed very similar behaviours and later followed their biological parents in obtaining a criminal record in adulthood (Kendler et al. 2014). This finding proves that criminal nature is hereditary and can be inherent through generations. Additionally a documentary, My Brother the Serial Killer, based on the serial killer Glen Rogers, supports the belief that criminal and aggressive behaviours is genetic and not caused by external environmental factors (Monaghan 2012). In this case the brother of Glen Rogers speaks out about the crimes and the arrest of his serial killer brother (Monaghan 2012). What is interesting to observe in this documentary that both Glen’s sister and brother did not display extreme violent nature like Glen had, although they were raised in same household. This behavioural difference can be understood by genetic variations or mutations that Glen possessed and his siblings did not. Overall, the twin study and Glen prove that our genes predispose our

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