Two sets of identical twins are given an intelligence test. One set of twins was reared by the same parents, while the second set of twins was separated at birth. Which set of twins will show highly similar intelligence test scores?

Question

Quizplus · Accepted Answer

Both sets of twins will show similarities in their intelligence test scores, but the set of twins reared together will have a higher degree of similarity than the set of twins reared apart due to shared environmental factors. However, genetic factors will also play a role in determining intelligence, so there will still be some differences between the two sets of twins.

Two Sets of Identical Twins Are Given an Intelligence Test