Genetic factors contribute to addiction risk in the material by approximately which statement is true?

Genetic factors contribute to addiction risk in the material by approximately which statement is true?

• A. Genetic factors account for about half the risk
• B. Genetic factors account for none of the risk
• C. Genetic factors account for all risk
• D. Genetic factors account for more than half the risk

Answer: (A)

Genetic influence on addiction risk is substantial but not absolute. Research on substance use disorders consistently shows a heritable component that explains about half of the variation in risk at the population level. In other words, genetics contribute roughly 50% of the differences in who develops an addiction, while the remaining variation comes from environmental factors, experiences, and interactions between genes and environment. This reflects findings from twin and adoption studies where identical twins show higher concordance than fraternal twins, indicating a real genetic effect, but not to the exclusion of environmental influence. Therefore, the statement that genetic factors account for about half the risk is the best answer. The other options overstate or understate the role of genetics, and the evidence supports a substantial but not exclusive genetic contribution.

Genetic influence on addiction risk is substantial but not absolute. Research on substance use disorders consistently shows a heritable component that explains about half of the variation in risk at the population level. In other words, genetics contribute roughly 50% of the differences in who develops an addiction, while the remaining variation comes from environmental factors, experiences, and interactions between genes and environment. This reflects findings from twin and adoption studies where identical twins show higher concordance than fraternal twins, indicating a real genetic effect, but not to the exclusion of environmental influence. Therefore, the statement that genetic factors account for about half the risk is the best answer. The other options overstate or understate the role of genetics, and the evidence supports a substantial but not exclusive genetic contribution.