People have always questioned the test of intelligence. Ridley introduces the search for the intelligence gene. A study done on the genes of a group of high-IQ children found a difference on the gene IGF2R on chromosome 6. Ridley concluded that intelligence genes do not work in a vaccum. Studies done on separated twins have shown that there is heritability to intelligence and personality. Ridley introduced the concept that the intelligence genes are indeed more expressive later in life rather than less expressive because people begin to choose their own environments and comfort zones. A study show in the elementary school children in Head Start programs are no longer ahead of their peers by the end of elementary school. A counterargument to the study show that genes are even more expressive in egalitarian environments.
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