The Correlation in IQ Scores Between Monozygotic Twins Reared Together

question 131

Multiple Choice

The correlation in IQ scores between monozygotic twins reared together is higher than that between dizygotic twins reared together.What does this difference indicate about role of environmental and genetic factors in the development of intellectual ability?

• A)Environmental factors have no impact.
• B)Genetic factors have no impact.
• C)Both genetic and environmental factors contribute equally.
• D)Genetic factors have a greater influence than environmental factors.

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