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

Question

Quizplus · Accepted Answer

Identical twins share 100% genetic material, thus they should have the highest correlation between their IQ scores if intelligence is primarily determined by heredity. Fraternal twins share 50% of their genes, while siblings share 50% on average but can vary widely in the specific genes they inherit. Parents and children also share 50% of their genes but may contribute to their children's IQ through environmental factors as well.

If Intelligence Is Determined Primarily by Heredity,which Pair Should Show