David Wants to Look at Genetic Influences on IQ,so He

question 118

Multiple Choice

David wants to look at genetic influences on IQ,so he administers a battery of tests to Frank and Fred,who are fraternal twins; Sidney and Sheldon,who are identical twins; and Larry and Harry,who are non-twin brothers.David's supervisor asks him to make estimate which set of siblings will most likely have the most similar IQs.What is David's best guess likely to be?

• A) Frank and Fred
• B) Sidney and Sheldon
• C) Larry and Harry
• D) As they're all siblings, the correlation should be about the same for all pairs.

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