Logical ReasoningDifficulty: Hard

PT139 S4 Q23 Explanation

Botanist: In an experiment

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

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Stimulus

Botanist: In an experiment, scientists raised domesticated radishes in a field with wild radishes, which are considered weeds. Within several generations, the wild radishes began to show the same flower color as the domesticated ones. This suggests that resistance to pesticides, which is often a genetically crop plants to their relatives that are considered weeds.

What this question is testing

Strengthen

Your task

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

Common trap

Answers that are consistent with the argument but add no real support, or that strengthen a claim the argument doesn't make.

Winning move

Locate the gap between evidence and conclusion, then pick the choice that closes 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, most strengthens the

Answer choices

  1. Weakens4% picked this

    It is much easier in principle for genetic traits to be passed from wild plants to their domesticated relatives than it is for such

    This hurts the plausibility of passing "pesticide resistance" from the domesticated/GMO kind to the wild/weedy relative. According to this answer, that's the harder direction to pass.

  2. No Impact20% picked this

    When the ratio of domesticated radishes to wild radishes in the field increased, the speed with which the flower color passed to

    This could be helpful info if we were trying to figure out how to speed up the passing of one trait from a domesticated plant to its wild relative. But we don't want to hear more about what worked with radishes. We really need to know if the stuff that worked with radishes, and with flower color, would also work with other crops and with pesticide-resistance.

  3. Weakens3% picked this

    Radishes are not representative of crop plants in general with respect to the ease with which various traits are passed among

    This is our nightmare. The author is extrapolating from the sample of what worked in the radish experiment. She's assuming that the radish experiment is a representative sample of what would generally work for crops / traits. If we learn that radishes are an outlier, that it's unusually easy with radishes for traits to pass from one species to a relative species, then it becomes less likely that this same behavior would also work well with other crop plants.

  4. Weakens, if anything14% picked this

    The flower color of the domesticated radishes had not been introduced into them

    One of the three differences we're worried about as we move from the experiment on radishes to the conclusion about other crop plants is that the radishes were domesticated (selectively bred to have a certain flower color) whereas the author is talking about genetically engineering the trait of pesticide resistance. That difference could potentially mean that what worked for radishes doesn't work for the author's plan. If, however, we knew that the domesticated radish's flower color had been genetically engineered, that would strengthen the argument. We would know that a genetically engineered trait is definitely capable of passing. This answer is saying that flower color was not genetically engineered, underscoring the potential difference between the author's Evidence and Conclusion.

  5. Correct59% picked this

    It is more difficult for flower color to be transferred between domesticated and wild radishes than it is for almost any other trait to

    Why this is right

    This is the "If I can ... make it there, I'll make it .... anywhere, ... it's up to you, New, York, New York" strengthener. We were worried that "just because it worked with flower color doesn't mean it will work with some other trait, like pesticide resistance". This answer allays that concern by saying, "Are you nuts? Flower color is the hardest trait to pass. If that one is possible, then all other traits are possible. to pass." So this increases the plausibility that pesticide-resistance could be a transmittable trait.

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

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