The Effect of Enviroment on Intelligence :: essays research papers

In the ongoing debate about which factor has more of an influence on human behavior and intelligence, trusted methodologies experience been employ to charm this in several different studies. The genetic component is made up of additive and non-additive components. The environmental component is separated into the make of a shared environment where both subjects physical exercised experience the same environment and a non-shared environment where the two subjects experience different environments. The studies that are used to determine the respective effects of genetics and environment are studies of how twins resemble each other, studies of adoption effects people compared to their relatives, and identification of genes. Twin studies use monozygotic twins who share 100% of their genes and dizygotic twins who are estimated to share 50% of their genes. Genetic identification tries to identify genes responsible for personality traits unless is made difficult by the fact th at many behaviors are caused by multiple genes. Intelligence or IQ has been canvas extensively. It has been found that in puerility the correlation of IQ between twins is about .5. This correlation has also been found to increase with age. Similar results have been found in adoption studies indicating that environmental differences are not as much of a factor on IQ scores. In addition to IQ several other things have been studied to find out if their cause is in the environment or genetics. Personality has been studied using the Big five traits that are commonly used to test personality. Personality disorders have also been studied as well as occupational interests and beliefs and attitudes. For all of the heritability has been rated to be the majority of the cause. There has been a lot of travail invested in finding specific genes that cause people to be a certain way however they have not been very successful.Studies have been conducted to determine the effects of shared environment on twins. Since they are known to have the same genes differences can only be attributed to environment and it has been found that twins embossed in different environments do not necessarily have more in common with regard to personality. However it has been found that shared environment does have an effect on cognitive ability and juvenile delinquency.While shared environment has not been shown to have a large effect non shared environmental factors have been shown to be a major source of variation.