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# Researchers studying the spread of the Black Plague in

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Intern
Joined: 01 Apr 2012
Posts: 10
GMAT Date: 07-14-2012
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Kudos [?]: 10 [0], given: 20

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07 Jul 2012, 06:08
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25% (medium)

Question Stats:

73% (02:28) correct 27% (01:52) wrong based on 202 sessions

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Researchers studying the spread of the Black Plague in sixteenth-century England claim that certain people survived the epidemic because they carried a genetic mutation, known as Delta-32, that is known to prevent the bacteria that causes the Plague from overtaking the immune system. To support this hypothesis, the researchers tested the direct descendants of the residents of an English town where an unusually large proportion of people survived the Plague. More than half of these descendants tested positive for the mutation Delta-32, a figure nearly three times higher than that found in other locations.

The researchers' hypothesis is based on which of the following assumptions?

(A) Delta-32 does not prevent a carrier from contracting any disease other than the Plague.
(B) The Plague is not similar to other diseases caused by bacteria.
(C) Delta-32 did not exist in its current form until the sixteenth century.
(D) No one who tested positive for Delta-32 has ever contracted a disease caused by bacteria.
(E) The Plague does not cause genetic mutations such as Delta-32.
[Reveal] Spoiler: OA
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07 Jul 2012, 06:21
The stimulus says Mutation caused immune to plague. As this is Assumption type question, we need to eliminate the possibility of the reversal of CAUSE and EFFECT.

So, only E addresses the issue. kudos if u like the post
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GMAT Date: 07-14-2012
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07 Jul 2012, 22:21
revanth4gmat wrote:
The stimulus says Mutation caused immune to plague. As this is Assumption type question, we need to eliminate the possibility of the reversal of CAUSE and EFFECT.

So, only E addresses the issue. kudos if u like the post

While I agree with your logic, I do not agree with your assumption. This is what I think about it:

Premise : More than half of the people tested positive for Delta-32; a lot of people survived Plague
Conclusion : People survived because of Delta-32

Here the assumption should be: The immunity to Plague does not cause the mutation Delta-32 and not The Plague does not cause mutation.

Correct me if I am wrong.

I would really appreciate if some expert can reply on this.

Thanks
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11 Mar 2015, 10:11
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Researchers studying the spread of the Black Plague in   [#permalink] 11 Mar 2015, 10:11
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