The IQ Correlation Is Higher for Dizygotic Twins Than for Brothers

question 216

Multiple Choice

The IQ correlation is higher for dizygotic twins than for brothers or sisters born at different times.This observation supports which conclusion?

• A)IQ scores have been increasing over generations.
• B)Hereditary factors influence intellectual development.
• C)Environmental factors influence intellectual development.
• D)Twins tend to be more intelligent than single-born children.

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