Your IQ score is more likely to be more similar to your identical twin's IQ than to your other siblings' IQ, even if you were raised apart.

Question

Quizplus · Accepted Answer

IQ has been found to have a high heritability rate, with genetics accounting for around 50-80% of IQ variations. Identical twins share 100% of their genes, while other siblings on average only share about 50% of their genes. Therefore, it is more likely that identical twins will have similar IQ scores, even if they were raised apart.

Your IQ Score Is More Likely to Be More Similar