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Revision Project: Male bowerbirds construct elaborately decorated nest

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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 03 Feb 2015, 21:30
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GMAT Club Revision Project - CR Q3


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Male bowerbirds construct elaborately decorated nests, or bowers. Basing their judgment on the fact that different local populations of bowerbirds of the same species build bowers that exhibit different building and decorative styles, researchers have concluded that the bowerbirds' building styles are a culturally acquired, rather than a genetically transmitted, trait. Which of the following, if true, would most strengthen the conclusion drawn by the researchers?

A. There are more common characteristics than there are differences among the bowerbuilding styles of the local bowerbird population that has been studied most extensively.

B. Young male bowerbirds are inept at bowerbuilding and apparently spend years watching their elders before becoming accomplished in the local bower style.

C. The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.

D. Bowerbirds are found only in New Guinea and Australia, where local populations of the birds apparently seldom have contact with one another.

E. It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.




This is how I approach a CR Problem :

Premise : Different local populations of bowerbirds of the same species build different kind of nests.
Conclusion : So Researchers have concluded that the bowerbirds' building styles are a culturally acquired, rather than a genetically transmitted, trait



A Potential Answer For this question should ideally talk about

a) The Reason why the Styles are different(Supporting the point that they are not acquired genetically).


A. There are more common characteristics than there are differences among the bowerbuilding styles of the local bowerbird population that has been studied most extensively.

This option says that the building Styles differ only slightly: This option is Neutral doesnt Really provide any information to support/Weaken the argument

B. Young male bowerbirds are inept at bowerbuilding and apparently spend years watching their elders before becoming accomplished in the local bower style.

This option Clearly says that these birds acquire this skill after they are born: By saying this it eliminates the possibility that the skill is genetically acquired:
So strengthens


C. The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.
The Argument is about Same Species bowerbirds So definitely out of scope

D. Bowerbirds are found only in New Guinea and Australia, where local populations of the birds apparently seldom have contact with one another.
Weakens the Conclusion

E. It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.
Totally irrelevant

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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 18 Feb 2015, 01:43
option D tad strengthens the argument saying local groups hardly interact so they must have learned it from their own groups but option B strongly strengthens by saying that young birds actually learn from elders.
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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 19 Feb 2015, 07:35
Indeed if Young male bowerbirds become accomplished in the local bower style by "watching" their elders, this tells us that it is not a "genetically" transmitted trait.

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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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souvik101990 wrote:

GMAT Club Revision Project - CR Q3


Please post a detailed explanation and answer to this question to get a chance to get Kudos and your explanation posted on the GMAT Club Revision PDF


Male bowerbirds construct elaborately decorated nests, or bowers. Basing their judgment on the fact that different local populations of bowerbirds of the same species build bowers that exhibit different building and decorative styles, researchers have concluded that the bowerbirds' building styles are a culturally acquired, rather than a genetically transmitted, trait. Which of the following, if true, would most strengthen the conclusion drawn by the researchers?

A. There are more common characteristics than there are differences among the bowerbuilding styles of the local bowerbird population that has been studied most extensively.

B. Young male bowerbirds are inept at bowerbuilding and apparently spend years watching their elders before becoming accomplished in the local bower style.

C. The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.

D. Bowerbirds are found only in New Guinea and Australia, where local populations of the birds apparently seldom have contact with one another.

E. It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.


Lots of different answers here so let's analyze this question:

Premises:

Male bowerbirds construct elaborately decorated bowers.
Different local populations of bowerbirds of the same species build bowers that exhibit different building and decorative styles,

Conclusion: The bowerbirds' building styles are a culturally acquired, rather than a genetically transmitted, trait

We need to strengthen the conclusion.

A. There are more common characteristics than there are differences among the bowerbuilding styles of the local bowerbird population that has been studied most extensively.

This tells us that there are more similarities than differences. This doesn't strengthen our argument at all. If anything, it weakens it by implying that quite a bit could be genetically transmitted since there are more similarities.

B. Young male bowerbirds are inept at bowerbuilding and apparently spend years watching their elders before becoming accomplished in the local bower style.

If bower building were a genetically transmitted trait, young bowers would have known how to build. But they do not and instead they acquire the skill by watching elders. This strengthens our argument that bower building skill is culturally acquired. Correct.

C. The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.

We are not comparing bowers of different species. We are talking about different local populations of the same species. Even if bower building were genetically transmitted, the genes of one species would be different from those of another so genetic transmission would be perfectly valid. Hence this option doesn't help us strengthen our argument that bower building is culturally acquired and not genetically transmitted.

D. Bowerbirds are found only in New Guinea and Australia, where local populations of the birds apparently seldom have contact with one another.

Whether they have contact or not doesn't matter. Whether they are in contact or no would have been useful to know if we were to show why there are similarities in bower building styles (Close contact with other populations could have been the reason for similarities) or if we were to prove that it is a genetically transmitted trait (far apart but similarities could have strengthened the case for genetic acquisition). The building styles are different so it doesn't matter how close or far apart the populations are.

E. It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.
Out of scope.

Answer (B)
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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 21 Feb 2015, 03:40
Option B states that the young ones learns the skill by seeing the elders and the talent is not inborn so this strengthens the argument

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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 21 Feb 2015, 05:15
ans B...
it gives a reason to show the skills are not inherited genetacally but by watching members perform their duties
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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 22 Feb 2015, 07:41
souvik101990 wrote:

GMAT Club Revision Project - CR Q3


Please post a detailed explanation and answer to this question to get a chance to get Kudos and your explanation posted on the GMAT Club Revision PDF


Male bowerbirds construct elaborately decorated nests, or bowers. Basing their judgment on the fact that different local populations of bowerbirds of the same species build bowers that exhibit different building and decorative styles, researchers have concluded that the bowerbirds' building styles are a culturally acquired, rather than a genetically transmitted, trait. Which of the following, if true, would most strengthen the conclusion drawn by the researchers?

A. There are more common characteristics than there are differences among the bowerbuilding styles of the local bowerbird population that has been studied most extensively.

B. Young male bowerbirds are inept at bowerbuilding and apparently spend years watching their elders before becoming accomplished in the local bower style.

C. The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.

D. Bowerbirds are found only in New Guinea and Australia, where local populations of the birds apparently seldom have contact with one another.

E. It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.


The conclusion is bowerbirds' building styles are a culturally acquired, rather than a genetically transmitted, trait.

To strengthen the argument we need something that will prove that bowerbirds' building styles are culturally acquired.

Ans. B correctly does this. Taking inept as example, the answer choice not only proves that local bower style comes from watching the elders but also shows that bower style doesn't come from genetic transmission.

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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 12 Mar 2015, 05:28
Answer-B. second best option E is unrelated.
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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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Can someone please explain why D is wrong? If they seldom have contact with each other, then they are culturally different. Does this not lend support to the fact that the building styles are culturally acquired?

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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 13 Jun 2015, 11:00
sudhanshu631 wrote:
Can someone please explain why D is wrong? If they seldom have contact with each other, then they are culturally different. Does this not lend support to the fact that the building styles are culturally acquired?


Hi!
We are told about two possible ways that building styles could be acquired by the said species:
1. Genetically transmitted.
2. Culturally acquired (the one that we should strengthen)

Let's know see what happens if we examine both under "D".

1. If that trait is genetically transmitted then it doesn't matter if they contact seldom or not. This argument doesn't prove or disprove this theory.

2. It they are culturally acquired then absence of contact will induce differences in building styles!
But that is not the question! The task is to support "culturally acquired" against "genetically transmitted". D does not do anything, both ways of acquiring the traits can be true under D.

Hope that helps!
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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 31 Jul 2015, 03:01
A: This would actually weaken the conclusion drawn by the researchers.
B: This would most strengthen the conclusion drawn by the researchers
C: This compares different type of species of bowerbirds making it difficult to strengthen the conclusion drawn by the researchers
D: Says nothing about the building styles
E: Out of scope

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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 23 Nov 2015, 10:06
ulm wrote:
It's truly (B)
I saw few other questions with the same line of reasoning.
But why we can't use (C)? I feel it's incorrect, but can't explain with words)



option talks about different species but not of same species.

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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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Hello from the GMAT Club VerbalBot!

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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 22 Sep 2016, 09:18
I think the option B is the right answer.

It says that the young are learning the activity by watching their elders. This indicates the characteristics of the culture which can be learnt but not inherited.

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Re: Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 07 Aug 2017, 22:24
VeritasPrepKarishma wrote:
souvik101990 wrote:

GMAT Club Revision Project - CR Q3


Please post a detailed explanation and answer to this question to get a chance to get Kudos and your explanation posted on the GMAT Club Revision PDF


Male bowerbirds construct elaborately decorated nests, or bowers. Basing their judgment on the fact that different local populations of bowerbirds of the same species build bowers that exhibit different building and decorative styles, researchers have concluded that the bowerbirds' building styles are a culturally acquired, rather than a genetically transmitted, trait. Which of the following, if true, would most strengthen the conclusion drawn by the researchers?

A. There are more common characteristics than there are differences among the bowerbuilding styles of the local bowerbird population that has been studied most extensively.

B. Young male bowerbirds are inept at bowerbuilding and apparently spend years watching their elders before becoming accomplished in the local bower style.

C. The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.

D. Bowerbirds are found only in New Guinea and Australia, where local populations of the birds apparently seldom have contact with one another.

E. It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.


Lots of different answers here so let's analyze this question:

Premises:

Male bowerbirds construct elaborately decorated bowers.
Different local populations of bowerbirds of the same species build bowers that exhibit different building and decorative styles,

Conclusion: The bowerbirds' building styles are a culturally acquired, rather than a genetically transmitted, trait

We need to strengthen the conclusion.

A. There are more common characteristics than there are differences among the bowerbuilding styles of the local bowerbird population that has been studied most extensively.

This tells us that there are more similarities than differences. This doesn't strengthen our argument at all. If anything, it weakens it by implying that quite a bit could be genetically transmitted since there are more similarities.

B. Young male bowerbirds are inept at bowerbuilding and apparently spend years watching their elders before becoming accomplished in the local bower style.

If bower building were a genetically transmitted trait, young bowers would have known how to build. But they do not and instead they acquire the skill by watching elders. This strengthens our argument that bower building skill is culturally acquired. Correct.

C. The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.

We are not comparing bowers of different species. We are talking about different local populations of the same species. Even if bower building were genetically transmitted, the genes of one species would be different from those of another so genetic transmission would be perfectly valid. Hence this option doesn't help us strengthen our argument that bower building is culturally acquired and not genetically transmitted.

D. Bowerbirds are found only in New Guinea and Australia, where local populations of the birds apparently seldom have contact with one another.

Whether they have contact or not doesn't matter. Whether they are in contact or no would have been useful to know if we were to show why there are similarities in bower building styles (Close contact with other populations could have been the reason for similarities) or if we were to prove that it is a genetically transmitted trait (far apart but similarities could have strengthened the case for genetic acquisition). The building styles are different so it doesn't matter how close or far apart the populations are.

E. It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.
Out of scope.

Answer (B)


Great Explanation Karishma! :-D
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Revision Project: Male bowerbirds construct elaborately decorated nest [#permalink]

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New post 07 Aug 2017, 22:49
I also want to add some more points for the options A and C,

Option A, There are more common characteristics than there are differences among the bowerbuilding styles of the local bowerbird population that has been studied most extensively.

It is talking about the extensive study. Although, more common characteristics of the bower building styles of the bower birds are studied most extensively, it actually does not matter whether the more common characteristics were studied or the differences among the bower building styles were studied extensively. We are concerned whether the bower building styles were culturally acquired or genetically acquired. Option A, does not provide any evidence for the same. Therefore, incorrect.

Option C, Even if choice C referred to different local populations of the same species and not the different species, it would still be wrong because it is simply restating the evidence submitted in the stimulus.

The argument states that different populations of bowerbirds build bowers that "exhibit different building and decorative styles."

Answer choice C merely restates this using irrelevant details about towers and ornamentation. This evidences the fact that different populations build different types of bowers, but it does not strengthen the researchers' conclusion, which was meant to answer why the birds build differently in the first place.
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