If genetic factors contribute to IQ scores,then fraternal twins should have:
A) less similar IQ scores than identical twins
B) more similar IQ scores than identical twins
C) more similar IQ scores than siblings
D) totally different IQ scores

Question

Quizplus · Accepted Answer

Fraternal twins share approximately 50% of their genes, just like siblings, while identical twins share 100% of their genes. Therefore, if genetic factors contribute to IQ scores, it is expected that identical twins have more similar IQ scores than fraternal twins, as they share more genetic material.

If Genetic Factors Contribute to IQ Scores,then Fraternal Twins Should