Logical ReasoningDifficulty: Easy

PT3 S2 Q23 Explanation

“DNA fingerprinting” is a recently-introduced

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

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Stimulus

“DNA fingerprinting” is a recently-introduced biochemical procedure that uses a pattern derived from a person’s genetic material to match a suspect’s genetic material against that of a specimen from a crime scene. Proponents have claimed astronomically high odds against obtaining a match by chance alone. These odds independence between the different characteristics represented by a single pattern.

What this question is testing

Weaken

Your task

Find the choice that makes the argument's conclusion less likely to be true.

Common trap

Answers that look negative but attack a claim the argument never relied on.

Winning move

Find the assumption the argument depends on, then pick the choice that undermines it.

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

The question
23.

Which one of the following, if true, casts the most doubt on the claim of the proponents

Answer choices

  1. Trap10% picked this

    The large amount of genetic material that people share with all other people and with other animals is not included

  2. Trap4% picked this

    There is a generally accepted theoretical basis for interpreting the patterns produced

  3. Correct79% picked this

    In the whole population there are various different subgroups, within each of which certain sets of

    Why this is right

    Answer C is correct.

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

  4. Trap2% picked this

    The skill required of laboratory technicians performing the DNA fingerprinting procedure

  5. Trap6% picked this

    In the investigation of certain genetic diseases, the techniques used in DNA fingerprinting have traced the transmission of the diseases among the

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