Logical Reasoning

PT3 · S2 · Q23 “DNA fingerprinting” is a recently-introduced

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

  • Save & drill this skill — build targeted practice sets from questions like this one

  • Video walkthroughs — watch every question solved step by step

  • 81 official LSATs — as questions, timed sections & full-length tests

Start practicing free

“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.

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.

23.

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

  1. The large amount of genetic

    Trap

    9% picked this

  2. There is a generally accepted

    Trap

    3% picked this

  3. Correct

    In the whole population there

    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.

    79% picked this

  4. The skill required of laboratory

    Trap

    1% picked this

  5. In the investigation of certain

    Trap

    7% picked this

Continue the review in LSAT Lab

Save this question, watch the video walkthrough, and drill similar questions in your LSAT Lab account.

Save and practice this skill
LSAT Lab

Turn this review into a targeted study plan.

Save this question, drill more like it, watch the video walkthrough, and track your progress in your LSAT Lab account.

Start practicing free