A scientist studying the heritability of IQ would expect to find the highest correlation between the IQ scores of
A) two unrelated children.
B) a child and his mother.
C) monozygotic twins.
D) dizygotic twins.

Question

Quizplus · Accepted Answer

The highest correlation in IQ scores would be expected between monozygotic twins because they share 100% of their genetic material. Dizygotic twins share on average 50% of their genetic material, so their correlation would be lower. Unrelated children share no genetic material, so their correlation would be even lower. While there may be some correlation between a child and his/her mother's IQ, it is not as high as between monozygotic twins because the mother only passes on 50% of her genetics to her child.

A Scientist Studying the Heritability of IQ Would Expect to Find