If intelligence is determined primarily by heredity, which pair should show the highest correlation between IQ scores?
A) fraternal twins
B) identical twins
C) brothers and sisters
D) parents and children
E) cousins

Question

Quizplus · Accepted Answer

Identical twins share 100% of their DNA, whereas fraternal twins only share around 50%. Therefore, if intelligence is primarily determined by heredity, identical twins should have the highest correlation in IQ scores compared to any other pair.

If Intelligence Is Determined Primarily by Heredity, Which Pair Should