In one massive study of 11,000 twin pairs in four countries,the heritability of general intelligence was found to be greatest during
A) early childhood.
B) middle childhood.
C) adolescence.
D) young adulthood.

Question

Quizplus · Accepted Answer

The heritability of general intelligence was found to be greatest during young adulthood in the massive study of 11,000 twin pairs in four countries. This suggests that genetic factors play a larger role in determining intelligence during this period of development.

In One Massive Study of 11,000 Twin Pairs in Four