In family-based studies, such as the transmission disequilibrium test TDT and haplotype relative risk HRR method, researchers examine which alleles or combinations of genes haplotypes are transmitted from parents to affected offspring Burmeister We have seen the problems associated with a child who is diagnosed with ADHD and how that can influence antisocial or criminal behavior.
It takes the right environment and personality to create an individual with antisocial or criminal tendencies and that is why this theory can be considered to take into account both factors of genetic and environmental influences. Xu, C. Personality psychologist Eysenck created a model based on three factors known as psychoticism, extraversion, and neuroticism, or what is referred to as the PEN model Eysenck, Certain psychological problems have been shown to be heritable and if given the right circumstances, individuals with those genes could find themselves engaging in criminal activity.
This is a study of particular interest because both sets of twins were raised in the same environment but in one case, the case of the monozygotic or identical twin sets, the siblings are genetically identical where as in the other case, the case of the dyzygotic or fraternal twin sets, the siblings are merely genetically similar.
One of the key methodological designs in behavioral genetic research is the classical twin design.
One additional research finding in the debate between genetic and environmental influences on antisocial or criminal behavior has to deal with the age of the individual. This negative result was reproduced by another study whose authors found an association between a variable number of tandem repeats VNTR polymorphism in MAOA and variation in impulsivity and aggression Manuck et al.
The mask of sanity.
This study was done using identical twins that were adopted by two different families and raised apart from each other. Dopamine beta hydroxylase The dopamine beta hydroxylase DBH enzyme increases the conversion of dopamine to norepinephrine. A significant fact that must be pointed out though is that not every individual with low arousal levels or those who are extraverts will seek those high risk activities just mentioned.
There is a vast amount of evidence that shows our criminal justice system is the new home for individuals with psychological problems.