Summer is Coming! Join the Game of Timers Competition to Win Epic Prizes. Registration is Open. Game starts Mon July 1st.

 It is currently 20 Jul 2019, 17:17

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Populations of a shrimp species at eleven different Indonesian coral

Author Message
TAGS:

### Hide Tags

VP
Joined: 30 Jan 2016
Posts: 1128
Populations of a shrimp species at eleven different Indonesian coral  [#permalink]

### Show Tags

15 Jun 2017, 11:12
2
1
00:00

Difficulty:

65% (hard)

Question Stats:

59% (02:03) correct 41% (02:19) wrong based on 279 sessions

### HideShow timer Statistics

Populations of a shrimp species at eleven different Indonesian coral reefs show substantial genetic differences from one reef to another. This is surprising because the area’s strong ocean currents probably carry baby shrimp between the different reefs, which would allow the populations to interbreed and become genetically indistinguishable.

Which one of the following, if true, most helps to explain the substantial genetic differences among the shrimp populations?

(A) The genetic differences between the shrimp populations are much less significant than those between shrimp and any other marine species.

(B) The individual shrimp within a given population at any given Indonesian coral reef differ from one another genetically, even though there is widespread interbreeding within any such population.

(C) Before breeding, shrimp of the species examined migrate back to the coral reef at which they were hatched.

(D) Most shrimp hatched at a given Indonesian coral reef are no longer present at that coral reef upon becoming old enough to breed.

(E) Ocean currents probably carry many of the baby shrimp hatched at a given Indonesian coral reef out into the open ocean rather than to another coral reef.

Source: LSAT

_________________
Non progredi est regredi
Senior PS Moderator
Joined: 26 Feb 2016
Posts: 3359
Location: India
GPA: 3.12
Re: Populations of a shrimp species at eleven different Indonesian coral  [#permalink]

### Show Tags

15 Jun 2017, 12:06
The argument states that despite being carried away from their original reef,
the shrimp(species) are genetically different at each reef, where as
they should be similar since few of the shrimp at each reef are available at each reef.

But, Option C (Before breeding, shrimp of the species examined migrate back to the coral reef at which they were hatched)
resolves the discrepancy because, if before breeding each of the species return to their original place, there will be genetic diversity at each reef.
_________________
You've got what it takes, but it will take everything you've got
Director
Joined: 27 May 2012
Posts: 815
Re: Populations of a shrimp species at eleven different Indonesian coral  [#permalink]

### Show Tags

16 Jun 2017, 02:57
Akela wrote:
Populations of a shrimp species at eleven different Indonesian coral reefs show substantial genetic differences from one reef to another. This is surprising because the area’s strong ocean currents probably carry baby shrimp between the different reefs, which would allow the populations to interbreed and become genetically indistinguishable.

Which one of the following, if true, most helps to explain the substantial genetic differences among the shrimp populations?
y
(A) The genetic differences between the shrimp populations are much less significant than those between shrimp and any other marine species.
(B) The individual shrimp within a given population at any given Indonesian coral reef differ from one another genetically, even though there is widespread interbreeding within any such population.
(C) Before breeding, shrimp of the species examined migrate back to the coral reef at which they were hatched.
(D) Most shrimp hatched at a given Indonesian coral reef are no longer present at that coral reef upon becoming old enough to breed.
(E) Ocean currents probably carry many of the baby shrimp hatched at a given Indonesian coral reef out into the open ocean rather than to another coral reef.

Source: LSAT

Kudos

But if interbreeding itself does not lead to genetic similarities , then even if they did not return back to their original reef , and did indeed interbreed then also there would be genetic differences . This could also explain the discrepancy.

This is what option B says, it says even within a particular reef there is wide genetic differences even though there is interbreeding , so these same shrimps when transferred to other reefs and after interbreeding could lead to the same result, i.e. genetic differences would be prevalent.

So why is B wrong?
_________________
- Stne
Manager
Joined: 24 Jan 2017
Posts: 142
GMAT 1: 640 Q50 V25
GMAT 2: 710 Q50 V35
GPA: 3.48
Re: Populations of a shrimp species at eleven different Indonesian coral  [#permalink]

### Show Tags

06 Jul 2017, 08:50
stne wrote:
Akela wrote:
Populations of a shrimp species at eleven different Indonesian coral reefs show substantial genetic differences from one reef to another. This is surprising because the area’s strong ocean currents probably carry baby shrimp between the different reefs, which would allow the populations to interbreed and become genetically indistinguishable.

Which one of the following, if true, most helps to explain the substantial genetic differences among the shrimp populations?
y
(A) The genetic differences between the shrimp populations are much less significant than those between shrimp and any other marine species.
(B) The individual shrimp within a given population at any given Indonesian coral reef differ from one another genetically, even though there is widespread interbreeding within any such population.
(C) Before breeding, shrimp of the species examined migrate back to the coral reef at which they were hatched.
(D) Most shrimp hatched at a given Indonesian coral reef are no longer present at that coral reef upon becoming old enough to breed.
(E) Ocean currents probably carry many of the baby shrimp hatched at a given Indonesian coral reef out into the open ocean rather than to another coral reef.

Source: LSAT

Kudos

But if interbreeding itself does not lead to genetic similarities , then even if they did not return back to their original reef , and did indeed interbreed then also there would be genetic differences . This could also explain the discrepancy.

This is what option B says, it says even within a particular reef there is wide genetic differences even though there is interbreeding , so these same shrimps when transferred to other reefs and after interbreeding could lead to the same result, i.e. genetic differences would be prevalent.

So why is B wrong?

Hi,

I think you're questioning the premise - "which would allow the populations to interbreed and become genetically indistinguishable", which should be taken as a fact.

Actually, information provided by option (B) is not related to the paradox needed to be solved. We need to find out why interbreeding between DIFFERENT populations from DIFFERENT coral reefs results in genetics differences, while option (B) focuses on interbreeding between individuals of the SAME population in the SAME reef. U see? This information doesn't help. (B) is gone.
Current Student
Joined: 08 Apr 2017
Posts: 89
Location: United States
Concentration: Finance, Other
GMAT 1: 750 Q48 V44
GPA: 3.77
Re: Populations of a shrimp species at eleven different Indonesian coral  [#permalink]

### Show Tags

06 Jul 2017, 14:13
2
Lucy Phuong wrote:
stne wrote:
Akela wrote:
Populations of a shrimp species at eleven different Indonesian coral reefs show substantial genetic differences from one reef to another. This is surprising because the area’s strong ocean currents probably carry baby shrimp between the different reefs, which would allow the populations to interbreed and become genetically indistinguishable.

Which one of the following, if true, most helps to explain the substantial genetic differences among the shrimp populations?
y
(A) The genetic differences between the shrimp populations are much less significant than those between shrimp and any other marine species.
(B) The individual shrimp within a given population at any given Indonesian coral reef differ from one another genetically, even though there is widespread interbreeding within any such population.
(C) Before breeding, shrimp of the species examined migrate back to the coral reef at which they were hatched.
(D) Most shrimp hatched at a given Indonesian coral reef are no longer present at that coral reef upon becoming old enough to breed.
(E) Ocean currents probably carry many of the baby shrimp hatched at a given Indonesian coral reef out into the open ocean rather than to another coral reef.

Source: LSAT

Kudos

But if interbreeding itself does not lead to genetic similarities , then even if they did not return back to their original reef , and did indeed interbreed then also there would be genetic differences . This could also explain the discrepancy.

This is what option B says, it says even within a particular reef there is wide genetic differences even though there is interbreeding , so these same shrimps when transferred to other reefs and after interbreeding could lead to the same result, i.e. genetic differences would be prevalent.

So why is B wrong?

Hi,

I think you're questioning the premise - "which would allow the populations to interbreed and become genetically indistinguishable", which should be taken as a fact.

Actually, information provided by option (B) is not related to the paradox needed to be solved. We need to find out why interbreeding between DIFFERENT populations from DIFFERENT coral reefs results in genetics differences, while option (B) focuses on interbreeding between individuals of the SAME population in the SAME reef. U see? This information doesn't help. (B) is gone.

Nowhere does it state that interbreeding actually occurs. It simply states that interbreeding would be potentially occur given that genetically different shrimp do come into contact with each other. One way to resolve this paradox would be to prove that interbreeding does not occur even if it is "possible". Answer choice C does just that - It explains why shrimp may not interbreed even though they do come in contact with one another.
Manager
Joined: 24 Jan 2017
Posts: 142
GMAT 1: 640 Q50 V25
GMAT 2: 710 Q50 V35
GPA: 3.48
Re: Populations of a shrimp species at eleven different Indonesian coral  [#permalink]

### Show Tags

07 Jul 2017, 04:51

Nowhere does it state that interbreeding actually occurs. It simply states that interbreeding would be potentially occur given that genetically different shrimp do come into contact with each other. One way to resolve this paradox would be to prove that interbreeding does not occur even if it is "possible". Answer choice C does just that - It explains why shrimp may not interbreed even though they do come in contact with one another.

Oh yes, my mistake. The above is not a proper explanation, I admit. Thank you.

kudos to you!
Retired Moderator
Joined: 28 Mar 2017
Posts: 1212
Location: India
GMAT 1: 730 Q49 V41
GPA: 4
Re: Populations of a shrimp species at eleven different Indonesian coral  [#permalink]

### Show Tags

07 Jul 2017, 05:10

Populations of a shrimp species at eleven different Indonesian coral reefs show substantial genetic differences from one reef to another. This is surprising because the area’s strong ocean currents probably carry baby shrimp between the different reefs, which would allow the populations to interbreed and become genetically indistinguishable.

Which one of the following, if true, most helps to explain the substantial genetic differences among the shrimp populations?

(A) The genetic differences between the shrimp populations are much less significant than those between shrimp and any other marine species. -We are not worried about the other marine species.
(B) The individual shrimp within a given population at any given Indonesian coral reef differ from one another genetically, even though there is widespread interbreeding within any such population. -We need not be worried about the distinction among the shrimp at a given location. We are worried about the shrimps' DNA at 11 different locations.
(C) Before breeding, shrimp of the species examined migrate back to the coral reef at which they were hatched. -CORRECT. It tells us that even though the shrimps are carried to other coral reefs by ocean currents, they are go back to their native place before breeding, which is responsible for the reduction in diversity.
(D) Most shrimp hatched at a given Indonesian coral reef are no longer present at that coral reef upon becoming old enough to breed. -Irrelevant
(E) Ocean currents probably carry many of the baby shrimp hatched at a given Indonesian coral reef out into the open ocean rather than to another coral reef. -It is a possibility that is not refuted by the author. But it definitely doesn't help us explain the genetic diversity, because some shrimps are definitely carried over to other coral reefs.

Hope it helps !!
-----------------------------------------------------------------------------------------------------------------------------------
Give kudos if this helped !
_________________
VP
Joined: 30 Jan 2016
Posts: 1128
Re: Populations of a shrimp species at eleven different Indonesian coral  [#permalink]

### Show Tags

27 Jul 2017, 00:23
Akela wrote:
Populations of a shrimp species at eleven different Indonesian coral reefs show substantial genetic differences from one reef to another. This is surprising because the area’s strong ocean currents probably carry baby shrimp between the different reefs, which would allow the populations to interbreed and become genetically indistinguishable.

Which one of the following, if true, most helps to explain the substantial genetic differences among the shrimp populations?

(A) The genetic differences between the shrimp populations are much less significant than those between shrimp and any other marine species.
(B) The individual shrimp within a given population at any given Indonesian coral reef differ from one another genetically, even though there is widespread interbreeding within any such population.
(C) Before breeding, shrimp of the species examined migrate back to the coral reef at which they were hatched.
(D) Most shrimp hatched at a given Indonesian coral reef are no longer present at that coral reef upon becoming old enough to breed.
(E) Ocean currents probably carry many of the baby shrimp hatched at a given Indonesian coral reef out into the open ocean rather than to another coral reef.

Source: LSAT

Kudos

Powerscore explanation:

Quote:

the apparent discrepancy presented in the stimulus.

This stimulus is quite generous, expressly stating the apparent paradox. Even though the area’s
strong ocean currents probably carry baby shrimp between the different reefs, which would allow for
the shrimp populations to interbreed and become genetically indistinguishable, the populations of a
shrimp species at eleven different coral reefs show substantial genetic differences from one reef to
another.

The correct answer choice will provide information that causes this surprising situation to occur, i.e.,
that causes the shrimp species to have substantial genetic differences despite the area’s strong ocean
currents. The incorrect answers will not provide an active resolution the apparent paradox, either
because they merely support one side, attack one side, or are irrelevant to the conclusion.

Answer choice (A): This information merely supports the fact that the shrimp populations are
genetically different, though their respective differences are less than between the shrimp and other
marine species.

Answer choice (B): This choice is irrelevant to the paradox, because it refers to individual shrimp
within a given population, while the paradox was concerned with genetic differences between shrimp
belonging to distinct coral reefs.

by showing that although the strong ocean currents may carry the baby shrimp between reef
populations, the shrimp return to the coral reef at which they were hatched before breeding. This
migration would reduce the possibility that the species would interbreed.

Answer choice (D): This choice merely supports the fact that the shrimp migrate from the reefs at
which they are hatched.

Answer choice (E): This choice attacks the idea the that currents carry the shrimp between the reefs,
stating instead that the shrimp are carried out into the open ocean.

_________________
Non progredi est regredi
Manager
Joined: 05 Dec 2014
Posts: 198
Location: India
GMAT 1: 690 Q48 V36
GPA: 3.54
Populations of a shrimp species at eleven different Indonesian coral  [#permalink]

### Show Tags

19 Aug 2018, 08:49
gmatexam439 wrote:

Populations of a shrimp species at eleven different Indonesian coral reefs show substantial genetic differences from one reef to another. This is surprising because the area’s strong ocean currents probably carry baby shrimp between the different reefs, which would allow the populations to interbreed and become genetically indistinguishable.

Which one of the following, if true, most helps to explain the substantial genetic differences among the shrimp populations?

(A) The genetic differences between the shrimp populations are much less significant than those between shrimp and any other marine species. -We are not worried about the other marine species.
(B) The individual shrimp within a given population at any given Indonesian coral reef differ from one another genetically, even though there is widespread interbreeding within any such population. -We need not be worried about the distinction among the shrimp at a given location. We are worried about the shrimps' DNA at 11 different locations.
(C) Before breeding, shrimp of the species examined migrate back to the coral reef at which they were hatched. -CORRECT. It tells us that even though the shrimps are carried to other coral reefs by ocean currents, they are go back to their native place before breeding, which is responsible for the reduction in diversity.
(D) Most shrimp hatched at a given Indonesian coral reef are no longer present at that coral reef upon becoming old enough to breed. -Irrelevant
(E) Ocean currents probably carry many of the baby shrimp hatched at a given Indonesian coral reef out into the open ocean rather than to another coral reef. -It is a possibility that is not refuted by the author. But it definitely doesn't help us explain the genetic diversity, because some shrimps are definitely carried over to other coral reefs.

Hope it helps !!
-----------------------------------------------------------------------------------------------------------------------------------
Give kudos if this helped !

gmatexam439.
Manager
Joined: 25 Jan 2018
Posts: 93
Location: United States (IL)
Concentration: Strategy, Operations
Re: Populations of a shrimp species at eleven different Indonesian coral  [#permalink]

### Show Tags

21 Aug 2018, 05:59
Populations of a shrimp species at eleven different Indonesian coral reefs show substantial genetic differences from one reef to another. This is surprising because the area’s strong ocean currents probably carry baby shrimp between the different reefs, which would allow the populations to interbreed and become genetically indistinguishable.

Which one of the following, if true, most helps to explain the substantial genetic differences among the shrimp populations?

Interesting Question !!! .Here is my thought process -
What are we looking for - There are differences among the species of shrimps in different coral reef, but the source of all the shrimps are same. What could be the reason of the difference ??

(A) The genetic differences between the shrimp populations are much less significant than those between shrimp and any other marine species.
-- Irrelevant. We are not concerned about other marine species.

(B) The individual shrimp within a given population at any given Indonesian coral reef differ from one another genetically, even though there is widespread interbreeding within any such population.
-- We are not concerned about the difference among the shrimps of the same coral reef. We need a reason for the difference among species found in different coral reef.

(C) Before breeding, shrimp of the species examined migrate back to the coral reef at which they were hatched.
-- So if they travel back to their own reef before breeding ,they may get features specific to the local reef. Keep it.

(D) Most shrimp hatched at a given Indonesian coral reef are no longer present at that coral reef upon becoming old enough to breed.
-- We are not concerned with this fact.

(E) Ocean currents probably carry many of the baby shrimp hatched at a given Indonesian coral reef out into the open ocean rather than to another coral reef.
-- This choice does n't help. It conveys that there should be more similarities among the shrimp species of different reef. Not , what we are looking.

C is the best choice.
Re: Populations of a shrimp species at eleven different Indonesian coral   [#permalink] 21 Aug 2018, 05:59
Display posts from previous: Sort by