Suppose that the presence of a particular gene is a necessary cause for the occurrence of schizophrenia. Which of the following statements is TRUE?
A) There are other things besides this gene that can cause schizophrenia.
B) The gene is also a sufficient cause for the occurrence of schizophrenia.
C) A person with that gene may or may not become schizophrenic.
D) Most people with schizophrenia will have that gene.

Question

Quizplus · Accepted Answer

A necessary cause means that the gene must be present for schizophrenia to occur, but it does not mean that the gene alone is sufficient to cause the disorder. Other factors may also be required.

Suppose That the Presence of a Particular Gene Is a Necessary