Relation between genetics & criminal behavior


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Relation between genetics & criminal behavior

  1. 1. Made by:  Md: Mahmudul Islam (Shajal)  Southeast University  LL,B department  Email: MISHAJAL3369@GMAIL.COM  F.B: Onirban Shajal
  2. 2. Relation Between Genetics & Criminal Behavior
  3. 3. What is genetics?  : Genetics is defined as hereditary characteristics and properties, or to the study of such characteristics. Generally Genetics deals with the molecular structure and function of genes, gene behavior in the context of a cell or organism patterns of inheritance from parent to offspring, and gene distribution, variation and change in populations, such as through Genome.
  4. 4. What is criminal behavior?  Criminal behavior refers to conduct of an offender that leads to and including the commission of an unlawful act. A trial court may utilize criminal behavior shown by a preponderance of the evidence to enhance a sentence without violating federal or state due process.
  5. 5.  To fully understand the of how genes and the environment influence criminal behavior, one must first know how criminal behavior is defined. determining what constitutes criminal behavior can envelope a wide variety of activities and for that reason, researchers tend to focus on the wider context of antisocial behavior.
  6. 6.  1)First is equating it with criminality and delinquency, which both involve engaging in criminal acts.  2)Secondly, they advise individuals to define antisocial behavior is through criteria used to diagnose certain personality disorders. More specifically, they mean those personality disorders, such as Antisocial Personality Disorder, which is associated with an increased risk in criminal activity.  3) The final measure suggested for defining antisocial behavior is by examining personality traits that may be influential in the criminal behavior of individuals. Traits such as
  7. 7. How gene effect in brain?  Neurochemicals are responsible for the activation of behavioral patterns and tendencies in specific areas of the brain. As seen in the Brunner et al. study, there have been attempts to determine the role of neurochemicals in influencing criminal or antisocial behavior. Included in the list of neurochemicals already cited by researchers are monoamine oxidase (MOA), epinephrine, norepinephrin e, serotonin, and dopamine.
  8. 8. Relation Between Genetics &Criminal Behavior  Monoamine oxidase (MAO) is an enzyme that has been shown to be related to antisocial behavior.  Serotonin is a neurochemical that plays an important role in the personality traits of depression, anxiety, and bipolar disorder. It is also involved with brain development and a disorder in this system could lead to an increase in aggressiveness and impulsivity .  Dopamine is a neurotransmitter in the brain that is associated with pleasure and is also one of the neurotransmitters that is chiefly associated with aggression.
  9. 9. Criminal Behavior and Personality Disorder:  In addition to the research showing that the gene responsible for production of monoamine oxidase has a possible link to criminality, some evidence has also shown a possible link between other genes. One area of personality research in molecular genetics that has received a lot of attention is the trait of noveltyseeking, and novelty seeking is a personality trait often associated with criminality. Research has indicated that the single DRD4 gene may account for 10% of the genetic variance in relation to noveltyseeking (Sloan, 2000). This conclusion is highly controversial because in subsequent studies there has been both replication of the original findings, and failure to replicate in other studies. It seems most molecular genetic approaches in relating heritability of personality characteristics such as criminality to a single gene frequently suffer from failures in replication.
  10. 10.  In addition to ADHD, CD, and ODD, other disorders have shown to influence criminality as well. Studies have shown that there is a higher occurrence of disorders such as schizophrenia, major depressive disorder, bipolar disorder, just to name a few. It is possible that having these personality disorders gives one a greater predisposition toward criminal behavior. A Swedish study found that the occurrence of major mental disorders in prisoners to be 5%, as well as a 20% occurrence of personality disorders (Rasmussen, 1999). Other studies have given different values for the occurrence, but in most cases the research agrees that there is a much higher incidence of these mental disorders in those who
  11. 11. THANK YOU