Of those listed below, the highest positive correlation between the IQ scores of relatives would occur between
A) identical twins reared apart.
B) fraternal twins reared together.
C) siblings close in age (within two years)reared together.
D) parents and their children.

Question

Quizplus · Accepted Answer

Identical twins share 100% of their genetic material, making them the most genetically similar pair. IQ is highly heritable, meaning that genes play a significant role in determining IQ scores. Therefore, the highest positive correlation in IQ scores would be expected between identical twins who share both genes and are reared apart, which removes any shared environmental effects.

Of Those Listed Below, the Highest Positive Correlation Between the IQ