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Intelligence is a product of complex interaction of heredity (nature) and environment (nurture). There are various which shows that intelligence is the result of heredity (nature) and environment (nurture). A study on twins and adopted children support this.
тАв The intelligence of identical twins reared together correlate almost 0.90. Twins separated early in childhood also show considerable similarity in their intellectual, personality and behavioural characteristics.
тАв The intelligence of identical twins reared in different environments correlate 0.72, those of fraternal twins reared together correlate almost 0.60, and those of brothers and sisters reared together correlate about 0.50, while siblings reared apart correlate about 0.25.
тАв Also, studies of adopted children show that children's intelligence is more similar to their biological rather than adoptive parents.
тАв With respect to the role of environment, studies have reported that as children grow in age, their intelligence level tends to move closer to that of their adoptive parents.
тАв Children from disadvantaged homes adopted into families with higher socio-economic status exhibit a large increase in their intelligence scores. There is evidence that environmental deprivation lowers intelligence while rich nutrition, good family background, and quality schooling increases intelligence.