Heritability estimates for Type I alcoholism are about 0.90 and about 0.40 for Type II, indicating that environmental factors are more important to understanding Type II alcoholism than Type I alcoholism.

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The statement is reversed. Heritability estimates for Type II alcoholism are about 0.40, indicating that genetic factors are less important in understanding Type II alcoholism compared to Type I alcoholism, for which heritability estimates are about 0.90. Therefore, environmental factors are more important in understanding Type I alcoholism than Type II alcoholism.

Heritability Estimates for Type I Alcoholism Are About 0