IQ scores are influenced by genetics from "summary" of IQ and Human Intelligence by Nicholas Mackintosh
The idea that IQ scores are influenced by genetics is not a new concept. Research over the years has consistently shown that intelligence, as measured by IQ tests, has a strong genetic component. This means that a significant portion of the variation in intelligence between individuals can be attributed to genetic factors. Studies of identical twins, who share 100% of their genes, have provided some of the most compelling evidence for the genetic basis of intelligence. These studies have shown that identical twins raised apart are more similar in their IQ scores than fraternal twins raised together. This suggests that genetic factors play a significant role in determining intelligence. In addition to twin studies, adoption studies have also provided evidence for the heritability of intelligence. These studies have shown that adopted children tend to have IQ scores that are more similar to their biological parents than to their adoptive parents. This further supports the idea that genetics play a key role in determining intelligence. It is important to note that while genetics play a significant role in shaping IQ, environmental factors also play a part. Factors such as nutrition, education, and socioeconomic status can all influence a person's IQ score. However, studies have shown that even when these environmental factors are taken into account, genetics still explain a substantial portion of the variation in intelligence between individuals.- The evidence suggests that IQ scores are indeed influenced by genetics. While environmental factors also play a role, genetic factors are a key determinant of intelligence. This understanding of the genetic basis of intelligence has important implications for how we think about education, psychology, and the nature of human intelligence.
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