There is a genetic basis for intelligence from "summary" of IQ and Human Intelligence by Nicholas Mackintosh
The idea that intelligence has a genetic basis is a topic of much debate and controversy in the field of psychology. Researchers have long sought to understand the extent to which genetics play a role in determining an individual's intelligence. While there is evidence to suggest that genetic factors do influence intelligence to some degree, the exact nature of this relationship is still not fully understood. One of the key pieces of evidence supporting the genetic basis for intelligence comes from studies of identical twins. Identical twins share 100% of their genetic material, making them ideal subjects for studying the heritability of intelligence. Research has shown that identical twins raised apart from each other tend to have very similar IQ scores, suggesting that genetics play a significant role in determining intelligence. Furthermore, studies of family members have also provided evidence for a genetic basis for intelligence. Children tend to have IQ scores that are more similar to those of their biological parents than to their adoptive parents, even when they are raised in different environments. This suggests that genetic factors are more important than environmental factors in determining intelligence. However, it is important to note that genetics is not the only factor that influences intelligence. Environmental factors, such as education, socioeconomic status, and access to resources, also play a significant role in shaping an individual's intelligence. It is likely that intelligence is the result of a complex interplay between genetic and environmental factors.- While there is evidence to suggest that there is a genetic basis for intelligence, the exact nature of this relationship is still not fully understood. More research is needed to better understand how genetics and environment interact to influence intelligence.
