Twin studies have found ______.
A) no significant correlation for rates of alcoholism in monozygotic or dizygotic twins
B) a greater concordance rate of alcoholism for monozygotic twins than for dizygotic twins
C) a greater concordance rate of alcoholism for dizygotic twins than for monozygotic twins
D) an equal concordance rate of alcoholism for monozygotic and dizygotic twins

Question

Quizplus · Accepted Answer

Twin studies have consistently found a greater concordance rate of alcoholism for monozygotic (identical) twins than for dizygotic (fraternal) twins. This suggests that genetic factors play a role in the development of alcoholism, as monozygotic twins share all of their genes while dizygotic twins share only about 50% of their genes on average.

Twin Studies Have Found ______