Which of the following suggests a genetic influence on addiction?
A) Identical twins are less likely than fraternal twins to have similarities in regard to alcoholism.
B) Fraternal twins are less likely than identical twins to have similarities in regard to alcoholism.
C) The risk for alcoholism is higher for women versus men.
D) The risk for alcoholism is higher for men versus women.

Question

Quizplus · Accepted Answer

Identical twins share 100% of their genes, while fraternal twins share about 50% of their genes. If identical twins are more likely than fraternal twins to have similarities in regard to alcoholism, it suggests a genetic component to the addiction, as identical twins' greater genetic similarity would be the variable accounting for their greater similarity in alcoholism risk.

Which of the Following Suggests a Genetic Influence on Addiction