June 2010 LSAT Section 4 Question 13

Psychologist: Identical twins are virtually the same genetically. Moreover, according to some studies, identical twin...

hatemz on April 21, 2020

How to not fall trap of answer E

In the stimulus, it seems like it took the cause of genetics to invoke the effect, inclinations... I see how D weakens the question completely, but it confuses me as to why you cant say E weakens it as well. The conclusion makes a statement about "our" as in many as a whole.. so twins who clearly have similar genes, not having the same inclinations, how is that not cause without effect?

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BenMingov on April 22, 2020

Hi Hatemz, thanks for the question.

I think what is tricky here is that this answer choice is providing you with the absolute opposite of what you are looking for. We are trying to weaken the argument that inclinations are rooted in our genetic makeup.

What answer choice E is saying is that twins with different genetic makeups have different inclinations. This follows with the argument saying that same genetics = same inclinations, because this shows different genetics = different inclinations. For this reason, answer choice E actually strengthens the argument rather than weakens it.

I hope this helps. Please let me know if you have any other questions or would like me to elaborate further.