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# It is proposed to introduce mosquitoes into the wild with geneti

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It is proposed to introduce mosquitoes into the wild with geneti  [#permalink]

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Updated on: 24 Sep 2014, 05:07
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It is proposed to introduce mosquitoes into the wild with genetic alterations that destroy their disease-carrying capacity. In this way, the dangerous wild population could eventually be replaced with a harmless one without leaving room for another disease-transmitting type to flourish. One candidate gene would interfere with the mosquito’s finding mates; another would cause destruction of a disease parasite before the stage at which it could be transmitted; another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease.

Which of the following identifies a discrepancy in the proposal above?

A.It is presupposed that the three genes would prove equally easy to isolate and insert into the cells of the mosquitoes.

B.Two of the ways of destroying disease carrying capacity in the wild would jeopardize the goal of the proposal.

C.It does not take into account positive roles that mosquitoes play in the environment, such as serving, in the larval stage, as food for fish.

D. None of the proposed alternatives would ensure that there would be fewer mosquitoes in any given area.

E. Evidence is not presented to show that each alternative method has been successfully tested on a wide scale.

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Originally posted by Gnpth on 24 Sep 2014, 04:08.
Last edited by carcass on 24 Sep 2014, 05:07, edited 1 time in total.
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It is proposed to introduce mosquitoes into the wild with genetic  [#permalink]

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19 Feb 2016, 12:43
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It is proposed to introduce mosquitoes into the wild with genetic alterations that destroy their disease-carrying capacity. In this way, the dangerous wild population could eventually be replaced with a harmless one without leaving room for another disease-transmitting type to flourish. One candidate gene would interfere with the mosquito’s finding mates; another would cause destruction of a disease parasite before the stage at which it could be transmitted; another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease.

Which of the following identifies a discrepancy in the proposal above?

A. It is presupposed that the three genes would prove equally easy to isolate and insert into the cells of the mosquitoes.
B. Two of the ways of destroying disease carrying capacity in the wild would jeopardize the goal of the proposal.
C. It does not take into account positive roles that mosquitoes play in the environment, such as serving, in the larval stage, as food for fish.
D. None of the proposed alternatives would ensure that there would be fewer mosquitoes in any given area.
E. Evidence is not presented to show that each alternative method has been successfully tested on a wide scale.
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Re: It is proposed to introduce mosquitoes into the wild with geneti  [#permalink]

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24 Sep 2014, 05:12
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Please: whenever post a question be really careful.

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Re: It is proposed to introduce mosquitoes into the wild with geneti  [#permalink]

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24 Sep 2014, 05:17
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Gnpth wrote:
It is proposed to introduce mosquitoes into the wild with genetic alterations that destroy their disease-carrying capacity. In this way, the dangerous wild population could eventually be replaced with a harmless one without leaving room for another disease-transmitting type to flourish. One candidate gene would interfere with the mosquito’s finding mates; another would cause destruction of a disease parasite before the stage at which it could be transmitted; another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease.

Which of the following identifies a discrepancy in the proposal above?

A.It is presupposed that the three genes would prove equally easy to isolate and insert into the cells of the mosquitoes.

B.Two of the ways of destroying disease carrying capacity in the wild would jeopardize the goal of the proposal.

C.It does not take into account positive roles that mosquitoes play in the environment, such as serving, in the larval stage, as food for fish.

D. None of the proposed alternatives would ensure that there would be fewer mosquitoes in any given area.

E. Evidence is not presented to show that each alternative method has been successfully tested on a wide scale.

B it is.

Last 2 genes are conflicting.
another would cause destruction of a disease parasite before the stage at which it could be transmitted; another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease.
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Re: It is proposed to introduce mosquitoes into the wild with geneti  [#permalink]

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26 Aug 2015, 12:48
"Two of the ways ..."(not mating & dying) Does this mean the 2nd gene would not jeopardize the goal of the proposal?
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It is proposed to introduce mosquitoes into the wild with genetic  [#permalink]

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19 Feb 2016, 20:33
"another would cause destruction of a disease parasite before the stage at which it could be transmitted; another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease."

These two ways are contradicting each other.

So, it should be B.
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Re: It is proposed to introduce mosquitoes into the wild with genetic  [#permalink]

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20 Feb 2016, 00:20
Nevernevergiveup wrote:
It is proposed to introduce mosquitoes into the wild with genetic alterations that destroy their disease-carrying capacity. In this way, the dangerous wild population could eventually be replaced with a harmless one without leaving room for another disease-transmitting type to flourish. One candidate gene would interfere with the mosquito’s finding mates; another would cause destruction of a disease parasite before the stage at which it could be transmitted; another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease.

Which of the following identifies a discrepancy in the proposal above?

A. It is presupposed that the three genes would prove equally easy to isolate and insert into the cells of the mosquitoes.
B. Two of the ways of destroying disease carrying capacity in the wild would jeopardize the goal of the proposal.
C. It does not take into account positive roles that mosquitoes play in the environment, such as serving, in the larval stage, as food for fish.
D. None of the proposed alternatives would ensure that there would be fewer mosquitoes in any given area.
E. Evidence is not presented to show that each alternative method has been successfully tested on a wide scale.

Objective here is to replace harmful mosquitoes will harmless ones.

option A - Out of Scope
Option B- Yes. The two options contradict the main objective.
Option C- Out of Scope
Option D- Fewer mosquitoes . Not relevant with the objective.
Option E- Out of Scope.

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Re: It is proposed to introduce mosquitoes into the wild with geneti  [#permalink]

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04 May 2016, 05:06
Hi Experts / chetan2u ,

PiyushK,
Can you please suggest how Last 2 genes are conflicting...?

In-fact I think the last 2 genes are similar, Second gene is causing destruction in disease parasite so that the disease can't be transferred and other is killing the mosquito so that the disease can't be transferred.

Actually, I am not able to comprehend this argument what it is trying to say.

Thanks and Regards,
Prakhar
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Re: It is proposed to introduce mosquitoes into the wild with geneti  [#permalink]

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04 May 2016, 05:55
3
PrakharGMAT wrote:
Hi Experts / chetan2u ,

PiyushK,
Can you please suggest how Last 2 genes are conflicting...?

In-fact I think the last 2 genes are similar, Second gene is causing destruction in disease parasite so that the disease can't be transferred and other is killing the mosquito so that the disease can't be transferred.

Actually, I am not able to comprehend this argument what it is trying to say.

Thanks and Regards,
Prakhar

HI,
I will straight talk of the role of three genes..
1) 1 is unambiguous about the role- it will not allow the population to increase by decreasing the mating between the wild mosquitos.
2) 2 will increase the immunity within the mosquito to fight the parasite so that the parasite spreading disease to humans via mosquito is killed by mosquito before it can spread the disease.
3) 3rd will decrease the resistance power of the mosquitos wherein the mosquitos instead of just spreading it get affected themselves and get killed by the parasite..

so if you look at it, in a way the 2nd gene is increasing the immunity and 3rd is decreasing the immunity of the mosquito. they are working in opposite directions
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Re: It is proposed to introduce mosquitoes into the wild with geneti  [#permalink]

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04 May 2016, 05:57
1
PrakharGMAT wrote:
Hi Experts / chetan2u ,

PiyushK,
Can you please suggest how Last 2 genes are conflicting...?

In-fact I think the last 2 genes are similar, Second gene is causing destruction in disease parasite so that the disease can't be transferred and other is killing the mosquito so that the disease can't be transferred.

Actually, I am not able to comprehend this argument what it is trying to say.

Thanks and Regards,
Prakhar

Hi Prakhar,

the question is basically this : creating a breed of mosquito with the following characteristics :

1) One candidate gene would interfere with the mosquito’s finding mates
2) Another would cause destruction of a disease parasite before the stage at which it could be transmitted
3) another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease.

So the assumption is that that particular breed of mosquito will breed with mosquitoes in the wild and produce offsprings with those characteristics and so on... resulting in reducing the parasite which kills the diseases.

But if you look closely at 1 and 3

1)One candidate gene would interfere with the mosquito’s finding mates

This means the mosquito will not be able to breed. Destroying the assumption

3) another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease.

Which means the mosquito is highly vulnerable to that disease. So as soon as it goes into the wild, it dies and shall no longer be able to breed or fulfill the assumption in the first place

These two points cancel assumption

As for 2) It's saying it will destroy the parasite before it is transmitted; not the mosquito. While 3 says that the mosquito will die. They are not the same at all 2 is killing the disease, 3 is killing the messenger
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Re: It is proposed to introduce mosquitoes into the wild with geneti  [#permalink]

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04 May 2016, 06:18
Hi Folks / chetan2u,

Thanks for your contribution and helping me to understand the argument.
I just want to reiterate the situation so that you can confirm I understood it correctly-

The are 2 entities-
1. Parasite
2. Mosquito
3. Human

Parasite enters in the mosquito to find mate
Mosquito gets the disease.
So, when Mosquito attack to human, Human gets the disease.

-->another would cause destruction of a disease parasite before the stage at which it could be transmitted;
This says, the gene will destruct PARASITE before it could transmit to MOSQUITO.

-->another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease.
This says, the gene will destruct MOSQUITO's resistance to PARASITE before it could transmit disease to HUMAN.

Am I thinking in right direction..??

Thanks and Regards,,
Prakahr
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Re: It is proposed to introduce mosquitoes into the wild with geneti  [#permalink]

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04 May 2016, 06:46
1
PrakharGMAT wrote:
Hi Folks / chetan2u,

Thanks for your contribution and helping me to understand the argument.
I just want to reiterate the situation so that you can confirm I understood it correctly-

The are 2 entities-
1. Parasite
2. Mosquito
3. Human

Parasite enters in the mosquito to find mate
Mosquito gets the disease.
So, when Mosquito attack to human, Human gets the disease.

-->another would cause destruction of a disease parasite before the stage at which it could be transmitted;
This says, the gene will destruct PARASITE before it could transmit to MOSQUITO.

-->another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease.
This says, the gene will destruct MOSQUITO's resistance to PARASITE before it could transmit disease to HUMAN.

Am I thinking in right direction..??

Thanks and Regards,,
Prakahr

Hi,
the beginning of whole thing could be--
1) The wild mosquitos are susceptible to these parasite, which cause disease. So, they get this parasite from some other diseased person or animal when they bite that person or animal, and they just become carrier/transmitter of it. The moment they bite some healthy person, they transmit the disease to him/her but in the process they do not get affected because of immunity in their body against these parasite.
2) Now what is the role of these genes..
a) 1st will make changes in their body such that they find it difficult to find a partner to mate. this will effect their population. slowly this NEW breed will replace the existing parasite carrying breed.
2) 2nd will produce changes such that they kill the parasite before it becomes powerful enough to get transmitted.
3) 3rd stage will weaken the resistance power of these mosquitos so that they themselves die of it rather than transmit..

Now the TWO discrepancies--
1) On one hand we are making changes 2 and 3 so that this new breed kills the parasite and slowly replaces the existing breed, BUT simultaneously the 1st gene is making it difficult to find partner to mate, finally this will effect this new breed too and their gene will not allow them to find partner, which we want to replace with.
2) 2nd and 3rd are almost doing the opposite thing - In a way one is increasing the immunity and the OTHER is destroying it..
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Re: It is proposed to introduce mosquitoes into the wild with geneti  [#permalink]

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03 Nov 2017, 21:16
the source of this question is from veritas prep.
Such question will be modified in the actually gmat, I believe so.

B is a common pattern, but in this question, it is hard to recognize the pattern in B.
B is indeed the correct b/c if mosquitoes cannot find mates, or die by its own disease, then mosquitoes will not serve the goal that "the dangerous wild population could eventually be replaced with a harmless one without leaving room for another disease-transmitting type to flourish."
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Re: It is proposed to introduce mosquitoes into the wild with genetic  [#permalink]

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03 Apr 2018, 20:18
[quote="Nevernevergiveup"]It is proposed to introduce mosquitoes into the wild with genetic alterations that destroy their disease-carrying capacity. In this way, the dangerous wild population could eventually be replaced with a harmless one without leaving room for another disease-transmitting type to flourish. One candidate gene would interfere with the mosquito’s finding mates; another would cause destruction of a disease parasite before the stage at which it could be transmitted; another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease.

Which of the following identifies a discrepancy in the proposal above?

A. It is presupposed that the three genes would prove equally easy to isolate and insert into the cells of the mosquitoes.
B. Two of the ways of destroying disease carrying capacity in the wild would jeopardize the goal of the proposal.
C. It does not take into account positive roles that mosquitoes play in the environment, such as serving, in the larval stage, as food for fish.
D. None of the proposed alternatives would ensure that there would be fewer mosquitoes in any given area.
E. Evidence is not presented to show that each alternative method has been successfully tested on a wide scale.[/quote]

I didn’t understand option B completely, it says two of the options however only one of the candidate gene is killing the carrier( the third one ) where as the other two seems benine to the mosquito

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It is proposed to introduce mosquitoes into the wild with genetic  [#permalink]

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10 Apr 2018, 20:13
One candidate gene would interfere with the mosquito’s finding mates; another would cause destruction of a disease parasite before the stage at which it could be transmitted; another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease.

Which of the following identifies a discrepancy in the proposal above

If the mosquito is unable to find a date that means the gene in the mosquito will not pass on to the general population.hence defeats the purpose since the harmful population of mosquitoes won't be replaced. For second discrepancy assume that it is in the final adult stage that the disease develops in the mosquito now either the mosquito dies or the parasite . Again no change in the existing harmful population

Hence B

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Re: It is proposed to introduce mosquitoes into the wild with genetic  [#permalink]

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22 Apr 2018, 23:45
Nevernevergiveup wrote:
It is proposed to introduce mosquitoes into the wild with genetic alterations that destroy their disease-carrying capacity. In this way, the dangerous wild population could eventually be replaced with a harmless one without leaving room for another disease-transmitting type to flourish. One candidate gene would interfere with the mosquito’s finding mates; another would cause destruction of a disease parasite before the stage at which it could be transmitted; another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease.

Which of the following identifies a discrepancy in the proposal above?

A. It is presupposed that the three genes would prove equally easy to isolate and insert into the cells of the mosquitoes.

B. Two of the ways of destroying disease carrying capacity in the wild would jeopardize the goal of the proposal.

C. It does not take into account positive roles that mosquitoes play in the environment, such as serving, in the larval stage, as food for fish.

D. None of the proposed alternatives would ensure that there would be fewer mosquitoes in any given area.

E. Evidence is not presented to show that each alternative method has been successfully tested on a wide scale.

A. Ease or difficulty to isolate or insert is not the concern. Even if the plan is successful with difficulties then it is good.

B. It shows the clear reason that if two ways would jeopardize the plan then plan is almost fails. Plan is to introduce harmless

mosquitoes, but as the premise says "another would disable the mosquito’s own resistance to disease, so that it would die before

transmitting the disease"
, this will jeopardize the proposal.

C, D, and E are Irrelevant to the discrepancy.

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Re: It is proposed to introduce mosquitoes into the wild with genetic  [#permalink]

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09 May 2018, 05:47
Our main intent is not to decrease population of mosquitoes but simply replacing them with harmless ones

1st and 3rd reason will decrease population of mosquitoes
1) If the mosquito is unable to find a date that means the gene in the mosquito will not pass on to the general population.hence defeats the purpose since the harmful population of mosquitoes won't be replaced

3)another would disable the mosquito’s own resistance to disease, so that it would die before transmitting the disease

So mosquitoes will die in this case too

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Re: It is proposed to introduce mosquitoes into the wild with genetic &nbs [#permalink] 09 May 2018, 05:47
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