Genes determine the structure of our bodies and may therefore be the reason why criminals commit such violent crimes. Scientists have thought about this and although it has been said that our life experiences only contribute to about half of the influence of this criminal behavior, there is no evidence to support this idea. However, after examining around 1000 DNA profiles, they discovered that there are two particular genes that are found in violent criminals and not in non-violent criminals. It is important to know that people who possess these two genes will automatically become criminals and there could be many other factors that contribute to this. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essay The researchers examined around 900 Finnish prisoners; the offenders had committed violent crimes or nonviolent crimes. They also took into account environmental factors, such as childhood or substance abuse. After looking at both criminals and the general population, they found two genes in particular associated with extremely violent behavior. The one gene, which had a low level of activity in violent criminals, was responsible for a protein called monoamine oxidase A (MAOA) and the other produced a member of the cadherin family, CDH13 (contributes to the production of dopamine, which plays an important role in addiction and helps control the reward and pleasure centers of the brain). The protein has been linked to substance abuse and ADHD. The study states that 5-10% of all extremely violent crimes committed in Finland could be related to these two genotypes. It is notable that these behaviors are extremely rare and that most individuals with these genes do not commit crimes. Furthermore, this should not be used to defend any criminals in court. The source does not have a publication date but the last paragraph tells us that it was made after the publication of Source 2, so it was written between October 2014 and 2018. There is no research that contradicts this source. There is no bias in this article and the language and tone were written by someone who has a high understanding of this topic. The findings are consistent with other findings I have read, and the authors did not deliberately omit any research. This can therefore be considered reliable. The author is unknown but there is supporting evidence because the source refers to several researchers, from different universities around the world, who conducted the study. The research was conducted in Finland and no, this does not affect the results because these two genes are found in people all over the world. This was then deemed partially valid, because we do not know the author. Please note: this is just an example. Get a custom article from our expert writers now. Get a Custom Essay This helps narrow down my search and increases my knowledge of the topic because it gave me more information about the two genes that could target criminals. The context is similar to my research. This can therefore be considered useful.