8th Edition

Module 33: Genetic and Environmental Influences on Intelligence 33-1 Genetic Influences people who share the same genes also share comparable mental abilities intelligence test scores of identical twins raised together are virtually the same brain scans indicate identical twins have the same gray matter volume adopted children?s intelligence scores become more like those of their biological parents over time and identical twins similarities continue or increase into their 80s. aka genes influence a lot. 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. If environments become more equal, the heritability of intelligence would INCREASE