The genetic influence on intelligence is illustrated by the finding that:
A)unrelated siblings raised together are more similar than are related siblings reared apart.
B)identical twins reared apart are more similar than are fraternal twins reared together.
C)parents and biological children living together are more similar than are parents and biological children living apart.
D)identical twins living together are more similar than are identical twins living apart.

Question

Quizplus · Accepted Answer

This option is known as the twin study, and it has been found that identical twins, who share all their genetic material, have more similar intelligence scores than fraternal twins, who only share 50% of their genes. This indicates a strong genetic component to intelligence. Additionally, when identical twins are reared apart, they still have very similar intelligence scores, which further supports the genetic influence.

The Genetic Influence on Intelligence Is Illustrated by the Finding