If IQ performance is heritable, which of the following pairs should show the highest correlation between IQ scores?
A) Fraternal twins
B) Identical twins
C) Parent and genetic offspring
D) Parent and adoptive offspring

Question

Quizplus · Accepted Answer

Identical twins share 100% of their genes, while fraternal twins share only about 50%, and genetic offspring share only about 50% with each parent. Adoptive children share none of their genes with their adoptive parents. Therefore, identical twins should show the highest correlation between IQ scores if IQ performance is heritable.

If IQ Performance Is Heritable, Which of the Following Pairs