The brains of identical twins are genetically identical. When only one of a pair of identical twins is a schizophreni...
ThaliaFebruary 27, 2020
Choice A vs. D
I understand why D contradicts the passage. But could you go into further detail as to why the same cannot be said about A? Since it was established that genetics do not play a role here (i.e. the different outcome amongst twins), can't we also conclude that choice A cannot be true since genetics is a non-factor? Is that stretching the argument a bit too far? Thanks.
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The author doesn't argue that there is no genetic element involved. Rather the author is saying that genetics are not the only factor. Otherwise, both twins would have schizophrenia. This is why D is correct.
A "genetic susceptibility" would be just an increased risk of schizophrenia, like a vulnerability to the physical damage that is described as the cause. It is something that both twins could share. They could both be susceptible, but only one of them might receive the physical damage to the brain structure.
So, it could still be possible that only people with a genetic susceptibility can be schizophrenic.
