Research results from twin and adoption studies have found that intelligence levels between _____ tend to be MORE correlated than between _____.

Question

Quizplus · Accepted Answer

Research in behavioral genetics has shown that monozygotic (identical) twins, whether raised together or apart, tend to have more similar intelligence levels compared to dizygotic (fraternal) twins or nontwin siblings, regardless of their upbringing. This suggests a strong genetic component to intelligence. Therefore, dizygotic twins raised together would have more similar intelligence levels than nontwin siblings raised together, because even though both sets are raised in the same environment, dizygotic twins share more of their genetic makeup with each other than nontwin siblings do on average.

Research Results from Twin and Adoption Studies Have Found That