What Is the Most Direct Evidence for a Genetic Explanation

question 56

Multiple Choice

What is the most direct evidence for a genetic explanation for substance use disorders?

• A) data from surveys of adults with alcohol use disorder
• B) higher rates of alcohol preference demonstrated in breeding studies
• C) the study finding that fraternal twins have a concordance rate of 30 percent for substance use disorder
• D) the study finding that individuals with substance use disorder are more likely to have an abnormal D2 receptor gene