Scott and Shawn are identical twins raised together, whereas Tammy and Tracey are identical twins raised apart. Scott and Shawn are more similar on IQ than are Tammy and Tracey. This finding:

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The finding that Scott and Shawn, who were raised together, are more similar in IQ than Tammy and Tracey, who were raised apart, suggests that the environment plays a significant role in determining IQ. This rules out a purely genetic explanation, as identical twins share the same genetics, yet their IQ similarity differs based on their environment.

Scott and Shawn Are Identical Twins Raised Together, Whereas Tammy