Variation that comes from aspects of environments that family members have in common 2. Decreases from infancy to adulthood a. Estimated at .35 in childhood and close to zero by adolescence b. Studied by unrelated children reared together in adoptive families 3. Individual differences in intelligence reflect more genetic causes in adults than children a.
Older persons are more likely to influence their environment by what they bring to it b.
More likely to choose an environment that is similar to genotype 2. Differences in cultural environment places values on different things and alters intellectual skills 2. Within some cultures, difference in class results in different trends on intelligence tests. Intelligence tests may predict influence. Intelligence tests may predict job opportunities.