poorvi125
GMATNinjaPlease help, how to eliminate option 'B' here.
Thanks!!
The botanist offers an example of a trait that passed from one type of radish to another: flower color.
He/she then concludes that "
this suggests that resistance to pesticides, which is often a genetically engineered trait, would also be passed from domesticated crop plants to their relatives that are considered weeds."
The "this suggests" means that the botanist is not only concluding that the resistance gene will be passed -- he/she is concluding that
the example actually leads to his/her conclusion.
Notice that the connection is pretty weak: we get an example of only ONE kind of plant passing a certain gene. The botanist thinks that this leads to a conclusion about a whole bunch of OTHER plants inheriting a completely DIFFERENT gene.
So, which answer choice strengthens the conclusion that the example actually does lead to the botanist's conclusion?
Take a look at (B):
Quote:
(B) When the ratio of domesticated radishes to wild radishes in the field increased, the speed with which the flower color passed to the wild radishes also increased."
(B) discusses the
speed at which flower color traits are passed. But the author doesn't care about how fast a trait is passed, he/she just cares that it
would be passed. So (B) is on thin ice.
More to the point, (B) doesn't do much work to show why the radish example leads to the botanist's conclusion. Sure, maybe (B) does a bit to strengthen the idea that the domesticated radishes are passing on the color gene, but what about the other plants? And what about the pesticide resistance gene? We get no insight into these issues.
Compare that with (E):
Quote:
(E) It is more difficult for flower color to be transferred between domesticated and wild radishes than it is for almost any other trait to be passed between any two similarly related plant species.
(E) tells us that transferring color flower is HARDER than transferring other traits in other species.
That provides beautiful support for the botanist's argument. If passing this trait is more difficult, then it strengthens the idea that the resistance gene would occur. This shows why the radish example leads to the overall conclusion.
Eliminate (B), and (E) is the correct answer.
I hope that helps!