Randy and Morty both suffer from alcohol use disorder. Each has a twin: Randy has a fraternal twin, Ricky, and Morty has an identical twin, Marty. As compared to Ricky's risk for alcohol use disorder, Marty's risk is ______.
A) the same
B) 1.5 times higher
C) 2 times higher
D) 3 times higher

Question

Quizplus · Accepted Answer

Identical twins share 100% of their genetic material, while fraternal twins share approximately 50%. Since alcohol use disorder has a genetic component, Marty's risk for alcohol use disorder is higher than Ricky's by a factor of 2.

Randy and Morty Both Suffer from Alcohol Use Disorder