Which of the following is true concerning "twin study" research findings?
A) Identical twins and fraternal twins share similarly high IQ correlations.
B) Fraternal twins have more similar IQ scores than identical twins.
C) Identical twins have more similar IQ scores than fraternal twins.
D) Identical twins raised together have less similar scores than identical twins raised apart.
Answer: C
Rationale: Identical twins are more alike in intelligence than are fraternal twins. Specifically, identical twins' intelligence scores have a correlation of approximately .85 when they are raised together, and approximately .80 when raised apart.
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