The Brain-behavior Link in Twins
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Environmentalists /nurture challenge the hereditarian arguments on several levels. First, they point out that there is no evidence of the existence of an "intelligence" gene or set of genes.
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Solution Summary
Much of the hereditarian/nature argument is based on two types of studies: those comparing IQ test performances of twins and those of adopted children. The explanation is given in 330 words with two references.
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Problem: Environmentalists /nurture challenge the hereditarian arguments on several levels. First, they point out that there is no evidence of the existence of an "intelligence" gene or set of genes.
Solution:
Much of the hereditarian/nature argument is based on two types of studies: those comparing IQ test performances of twins and those of adopted children. Because identical twins have the same genetic endowment, it is thought that any differences observed between them should be attributable to the effects of the environment. Hereditarians also suggest that one should observe more similarities in the IQs ...
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