Logical ReasoningDifficulty: Medium

PT106 S2 Q21 Explanation

The point at issue between Wirth

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

TopicsAgree/Disagree

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Stimulus

Wirth: All efforts to identify a gene responsible for predisposing people to manic-depression have failed. In fact, nearly all researchers now agree that there is no “manic-depression gene.” Therefore, if these researchers are right, genetically predisposed to manic-depression is simply false.

Chang: I do not dispute your evidence, but I take issue with your conclusion. Many of the researchers you refer to have found evidence that a set of several genes is involved genes produce a predisposition to manic-depression.

What this question is testing

Agree/Disagree

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
21.

The point at issue between Wirth and Chang

Answer choices

  1. Nobody Agrees15% picked this

    efforts to identify a gene or set of several genes responsible for predisposing people to manic-

    Wirth never discusses any efforts to identify a set of genes responsible for manic-depression. He only says that efforts to identify a (single) gene have all failed.

  2. No Support for Either3% picked this

    it is likely that researchers will ever be able to find a single gene that

    Neither person discusses the likelihood of certain discoveries / breakthroughs.

  3. Both Agree4% picked this

    nearly all researchers now agree that there is no

    This is part of the "I do not dispute your evidence".

  4. Correct76% picked this

    current research supports the claim that no one is genetically predisposed

    Why this is right

    W agrees, and C disagrees. The "current research" part of the answer is certainly an unnerving surprise, but W says, "If these researchers are right", referring to nearly all researchers. And C says "many of the researchers you refer to". In a broader sense, W is saying, "Welp ... they can't find a manic-depression gene. That means no one is genetically predisposed to manic-depression." And C is saying, "Yes, they can't find a a manic-depression gene. But their evidence suggests that people CAN be genetically predisposed to manic-depression, because they're finding a set of genes that interacts to create a predisposition.

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

  5. No Support for Either: thorough1% picked this

    the efforts made to find a gene that can produce a predisposition to

    Neither person discusses how thorough these efforts were. If anything, it feels like W is giving off the impression that there have been lots of efforts, and C said "I do not dispute that".

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