If a fraternal twin develops schizophrenia,the likelihood of the other twin developing serious mental illness is much lower than with identical twins. This suggests that

Question

Quizplus · Accepted Answer

The fact that fraternal twins have a lower likelihood of developing schizophrenia if their twin has the illness suggests that genes play a role in the development of the disorder, but it is not solely determined by genes. Environment and other factors may also contribute to the development of schizophrenia. Therefore, option B ("schizophrenia is influenced by genes") is the best choice.

If a Fraternal Twin Develops Schizophrenia,the Likelihood of the Other