Logical ReasoningDifficulty: Easy

PT145 S2 Q5 Explanation

A person’s personality is linked

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsParallel Flaw

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Stimulus

A person’s personality is linked to that person’s genes. And since a person’s genes do not ordinarily change over time, it follows that a with the passing of time.

What this question is testing

Parallel Flaw

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
5.

Which one of the following is most closely parallel in its reasoning to the flawed reasoning in

Answer choices

  1. Correct90% picked this

    The way historians understand the First World War is related to what happened in that war. But what actually happened in that war cannot

    Why this is right

    This looks dreamy. We can match it, ingredient for ingredient. Premise 1 - X is linked to Y. Historians' understanding of WWI is linked to actual events of WWI. Premise 2 - Y doesn't change over time. Actual events of WWI cannot change. Conclusion - X doesn't change over time Historians' understanding of WWI cannot change.

    Skill tested: Parallel Flaw · how this choice captures the argument's function is the move to repeat next time.

  2. Bad Evidence / Conclusion Match2% picked this

    Market forces are to some degree influenced by governmental actions. Hence, a change in the government’s policies could result in

    First of all, this only has one premise. That's enough to disqualify. The original argument had two premises. Secondly, this conclusion's strength of language is totally different: X could result in a change (choice A) vs. X remains unchanged over time (original)

  3. Bad Evidence / Conclusion Match1% picked this

    It is well known that some diseases have genetic causes. Therefore, it should be possible to prevent such diseases by manipulating

    First of all, this only has one premise. That's enough to disqualify. The original argument had two premises. Secondly, this conclusion's strength of language is totally different: X should be possible by doing Y vs. X remains unchanged over time (original)

  4. Bad Evidence / Conclusion Match2% picked this

    Getting regular exercise over a long period contributes to the prevention of heart disease. Therefore, getting regular exercise over a short period contributes slightly

    First of all, this only has one premise. That's enough to disqualify. The original argument had two premises. Secondly, this conclusion's type of claim is totally different: X contributes slightly to Y vs. X remains unchanged over time (original)

  5. Bad Evidence / Conclusion Match5% picked this

    The levels of certain hormones control body temperature. Therefore, if one has a high fever, the levels of one’s hormones

    First of all, this only has one premise. That's enough to disqualify. The original argument had two premises. Secondly, this conclusion's type of claim is totally different: If X is high, then Y is high as well vs. X remains unchanged over time (original)

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