Which assumption is made by researchers using the twin study method?
A. Dizygotic twins share an environment that is more similar than the environment shared by monozygotic twins.
B. Monozygotic twins share an environment that is more similar than the environment shared by dizygotic twins.
C. Dizygotic twins share an environment that is just as similar as the environment shared by monozygotic twins.
D. Monozygotic twins will be treated more alike than dizygotic twins.
Question 2
A psychologist conducts research using the twin-study method. He administers a need for Achievement scale to sets of monozygotic and dizygotic twins and finds a correlation of .50 between the scores for pairs of monozygotic twins. If this study is to demonstrate evidence for a genetic influence on need for Achievement, what would we expect the correlation to be between scores for pairs of dizygotic twins?
A. Higher than .50
B. Lower than .50
C. Very close to .50
D. There is no way to demonstrate a genetic influence with these data.
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