Genes and Envt on Human Behavior

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Discuss the balance of genetic and environmental influences on human behaviour (22) Genetic influences are defined as any ability determined by genes (the influence of DNA and chromosomes) on our behaviour, usually meaning those inherited from your parents. However it also includes those that appear through maturation (develop over time). The impact of genetics on our behaviour has been studied using a variety of methods. For example twin studies have been conducted to see how it demonstrates genetic influences. Twin studies takes on the biological approach, seeing if psychiatric illnesses could be inherited. Holland et al found that MZ twins have a higher concordance rate of the psychiatric illness than DZ twins, suggesting a strong influence of genetic influence on human behaviour. As the MZ twins share the exact same genetics as opposed to DZ twins, this would highlight the genetic factor as to why the MZ twins have a higher rate of the illness. However, despite the stats, the Biological approach has been criticised for its methodology. The main point being even though MZ twins share the same genetics this should mean that the concordance rates should be 100% which they aren’t. Suggesting other factors may be involved in the influence on behaviour. Also as the MZ twins share the same environment this could also suggest how the researcher knows that it is genetics effecting the influence but the environment. The evolutionary approach offers support for the influence of genes on human behaviour as it was done across many different environments, eliminating the social/environmental factors. Buss conducted a cross cultural study on mate preferences across 57 countries and despite initial thoughts still found the same reoccurring themes despite the difference in environments. Buss’ study suggests genetic factors take a role. However, this approach can also be
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