Genetics Vs. Environment

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IQ depends fully on the genes of a person and their hereditary. This is a common myth concerning IQ but now scientist know this myth isn't true and they're able to prove this by replicating studies involving genes and the environment. The most common used test to study genes and the environment is by studying Monozygotic and Dizygotic twins. Monozygotic twins result from the fertilization of a single egg by a single sperm, sharing 100% of their genetic material. Dizygotic are fraternal twins who are non-identical, they result from the independent fertilization of two eggs by two sperm and share on average 50% of their genes. Studies have found that if genetics is important than Monozygotic twins will be 100% similar in IQ and Dizygotic twins will differ in IQ because they only share 50% of their genes. If genetics in not important than both pair of twins will be affected by their environment by 100%. Also the correlation for IQ for Monozygotic twins is strongly correlated with a result of .82, where Dizygotic twins have a correlation of .51, and Adopted siblings with a correlation of .18. Adopted siblings are genetically unrelated individuals reared together in the same environment. This study proves that genes and the environment are very important to an individual concerning IQ. According to the Link provided, IQ is a combination of genes and our environment. If genes affect 40 to 80 percent of our IQ than the remaining percentage comes from our environment. The misconception that IQ is solely based on genes is incorrect. Also many people assume if a child is born having parents with a low IQ they will also have a low IQ put we know now that this is incorrect. With the power of replicability scientists now are aware that both genes and environment are two important factors that influence our IQ.


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While I agree with your point that genes and environment both play a role, the numbers you give (.82 correlation and heritablity estimate of up to 80%) suggest that really it is almost entirely genetics. Correlations of .82 are almost unheard of in behavioral research. Is all of the other variablity due to environment? Couldn't there be other factors? Can we ever expect a perfect correlation.

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This page contains a single entry by jeyla011 published on November 16, 2011 3:24 PM.

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