CHILD DEVELOPMENT PEDAGOGY

Detailed explanation-1: -There are confounding variables in twin studies. Just because twins share the same home and parents, it doesn’t mean their upbringing has been exactly the same. They may have different friends, interests and relationships and these differences may grow more pronounced as the twins grow older.

Detailed explanation-2: -These studies showed that IQ is very heritable (although the environment still plays a role in determining your IQ). We can tell this because the IQ of identical twins are almost always the same and non-identical twins are only sometimes the same.

Detailed explanation-3: -Twin studies allow disentanglement of the shared genetic and environmental factors for the trait of interest. Researchers can estimate the proportion of variance in a trait attributable to genetic variation versus the proportion that is due to shared environment or unshared environment.

Detailed explanation-4: -Early twin studies of adult individuals have found a heritability of IQ between 57% and 73%, with some recent studies showing heritability for IQ as high as 80%. IQ goes from being weakly correlated with genetics for children, to being strongly correlated with genetics for late teens and adults.