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Module 33 - Module 33 Genetic and Environmental Influences...

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Module 33: Genetic and Environmental Influences on Intelligence Genetic Influences Heritability: the proportion of variation among individuals that we can attribute to genes. The heritability of a trait may vary, depending on the range of populations and environments studied. Environmental Influences Studies of twins, family members, and adopted children also provide evidence of environmental influence on intelligence. The intelligence test scores of fraternal twins raised together are more similar than those of other siblings, and the scores of identical twins raised apart are less similar (though still very highly correlated) than the scores of identical twins raised together. Studies of children reared in extremely impoverished, enriched, or culturally diff environments further indicate the influence of life experiences on test scores. Group Differences in Intelligence Test Scores Ethnic Similarities and Differences - Race is not a neatly defined biological category.
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