The brains of identical twins are genetically identical. When only one of a pair of identical twins is a schizophreni...

christinea303 June 24, 2020

Answer A

A: People who lack a genetic susceptibility for the disease will not develop schizophrenia. Doesn't that read as "all people who lack a genetic susceptibility for the disease will not develop schizophrenia"? How come this answer is referring to people in part? Isn't "people who lack" considered sufficient for the disease not developing? Is this statement actually saying "some people who lack the genetic susceptibility not get it? Thanks

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Skylar June 24, 2020

@christinea303, happy to help!

The statement "people who lack a genetic susceptibility for the disease will not develop schizophrenia" can be thought of in the same way as "if you lack a genetic susceptibility for the disease, then you will not develop schizophrenia." In diagram form, this looks like: no GS -> no S. Therefore, not having genetic susceptibility is sufficient and not developing schizophrenia is necessary. The contrapositive is: S -> GS. Therefore, this statement is referring to all people who lack genetic susceptibility, but not to all people (including both those who do and do not lack genetic susceptibility) in general.

Does that make sense? Hope it helps! Please let us know if you have any other questions!