Based on current research, which statement is most justified?

Question

Quizplus · Accepted Answer

Current research supports the idea that genetics increase a person's vulnerability to develop schizophrenia, but other environmental and lifestyle factors can also contribute to the development of the disorder. While there may be some genetic factors that are necessary for the development of schizophrenia, it is not a sufficient condition on its own. It is also not true that genetics cannot play a significant role in the cause of schizophrenia just because some people with the disorder have no close relatives who have it.

Based on Current Research, Which Statement Is Most Justified