June 2013 LSAT, LR2, Q23, a botanist experiments with radishes

Crowdsourcing the June 2013 LSAT:  June 2013 LSAT Explanation Central | About this project Graeme Blake is an LSAT instructor in Montreal. He scored a 177 on the June 2007 LSAT, and has taught for Testmasters and Ivy Global.

The former VP of Curriculum Development at 7Sage LSAT, he's the moderator of Reddit's LSAT forum, and the author of the Hacking The LSAT book series, which offers explanations for LSAT preptests.

You can find his books on amazon, or go to http://lsathacks.com for more information.

This explanation is an excerpt from Graeme's upcoming book of explanations for LSAT 69, which will be available on amazon in the next few days. Graeme thinks LSAT Prep should be a lot less expensive than it is, and thinks that Nathan's project is a great idea.

Guest Blogger: Graeme Blake


CONCLUSION: Pesticide resistance would spread from crops to their relatives that are weeds.

REASONING: Flower color spread from domestic radishes to wild radishes. Pesticide resistance is genetically engineered.

ANALYSIS: We don't know much about the spread of genetic traits. Maybe flower color is easier to spread than other traits.

  1. A.  Maybe traits can spread easily in radishes, but not in other plants.
  2. B.  Maybe genetically engineered traits are hard to spread.

To strengthen this argument, we could prove the opposite of one of those statements.

For example, suppose traits are harder to spread in radishes than in other plants. Then the fact that the trait did spread in radishes is evidence that traits could spread in other plants too.


A.  It doesn't matter how easy it is to spread a trait from a wild to a domestic. The stimulus only talks about spreading from domestic to wild. B.  This is vague. Maybe it took a 50% increase in the ratio to increase spread speed by 1%. What does that tell us? It's not clear what effect this has on the spread of other traits. C.  If radishes are not representative, then the argument is weaker. Radishes may not prove anything about other plants. D.  Pesticide resistance is a genetically engineered trait. The argument would be stronger if flower color was genetically engineered too. That would prove that genetically engineered traits could spread. This is a weaken answer. E.  CORRECT. This shows that almost any other genetic trait could spread more easily than radish color. So this experiment is fairly strong evidence that other traits such as pesticide resistance could spread.

Please ask questions and/or suggest corrections to anything that seems confusing... we want to make this the best resource we can for LSAT students. We'll have all the June 2013 explanations up as quickly as possible. Thanks for reading. Tell your friends! --nathan

Crowdsourcing the June 2013 LSAT:  June 2013 LSAT Explanation Central | About this project