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Determining whether a given population of animals constitutes a

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Re: Determining whether a given population of animals constitutes a  [#permalink]

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New post 01 May 2018, 23:36
I have defined the gap in above post. Do you have any specific question. At least give your reasoning.

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Re: Determining whether a given population of animals constitutes a  [#permalink]

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New post 02 May 2018, 06:00
siddharthfrancis wrote:
why is the answer to the 4th questions B and not E. ??


hey siddharthfrancis,

The statement B says
B)It demonstrates why the biological species concept is invalid.

According to the author, the idea is too restrictive. From this statement, we can easily infer that this idea carries some value; it doesn't matter how much.
So, the biological species concept is not invalid.
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Re: Determining whether a given population of animals constitutes a  [#permalink]

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New post 02 May 2018, 06:45
siddharthfrancis wrote:
why is the answer to the 4th questions B and not E. ??


Check out this post from Lucy Phuong.
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Re: Determining whether a given population of animals constitutes a  [#permalink]

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New post 28 Sep 2018, 12:11
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siddharthfrancis wrote:
why is the answer to the 4th questions B and not E. ??

Dear siddharthfrancis,
Happy to help here.

Quote:
Which of the following best describes the function of lines 10-13?

Line 10-13: [First, mating between groups labeled as different species (hybridization), as often occurs in the canine family, is quite common in nature.]
To well understand this line, Kindly make sure that you read some part of the passage before and after the line.

Quote:
According to this view, a species is a group of animals that can mate with one another to produce fertile offspring but cannot mate successfully with members of a different group. Yet this idea can be too restrictive.
If I read this line before the highlighted line, the thing that stands out to me is the one mentioned in bold."Yet this idea can be too restrictive". This gives me a gist that author is going to mention some restriction or something that holds back the biological species concept.

First, mating between groups labeled as different species (hybridization), as often occurs in the canine family, is quite common in nature.

Quote:
Second, sometimes the differences between two populations might not prevent them from interbreeding, even though they are dissimilar in traits unrelated to reproduction; some biologists question whether such disparate groups should be considered a single species.
Even though this may be left unread, but if you still read this, it shows that this sentence starts with Second which means that it is to add the point further which is conveyed in the highlighted sentence.
Quote:
B. It develops a point about the biological species concept made in the previous sentence.
The highlighted text in line 10-13 actually adds value/develop/makes concrete the previous sentence "Yet this idea can be too restrictive." The highlighted sentence actually explains one of the three restrictions mentioned, as discussed above. Hence this is correct.
Quote:
E. It demonstrates why the biological species concept is invalid.
While E says it demonstrates why biological species concept is invalid. The passage no where says that the biological species concept is invalid. Though the highlighted text mentions the restriction of biological species concept, but the validity has not been challenged anywhere.
Kindly see the text in the first line of second paragraph, which says "When the biological species concept is difficult to apply" but not invalid....

I hope this helps.
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Re: Determining whether a given population of animals constitutes a  [#permalink]

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New post 04 Dec 2018, 22:40
Can anyone please explain why option c in question 3 is wrong.
In the opening line it is mentioned that no single definition of the term exists. Is "Arbitary process" a too far interpretation of the same.
Kindly help
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Re: Determining whether a given population of animals constitutes a  [#permalink]

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New post 20 Dec 2018, 16:53
pratiknayan10 wrote:
Can anyone please explain why option c in question 3 is wrong.
In the opening line it is mentioned that no single definition of the term exists. Is "Arbitary process" a too far interpretation of the same.
Kindly help

I believe you're referring to choice (B):

Quote:
B. Because no standard definition exists for what constitutes a species, the classification of animal populations is inevitably an arbitrary process.

And yes, you're on the right track. The second half of this statement does not reflect what the author has written.

If the classification of animal populations were inevitably an arbitrary process, then no matter what scientists may try, we wouldn't expect them to ever classify animal populations in a consistent way. Yet, in the second paragraph, the author suggests that phenotype comparison might reasonably be used to group animals into distinct species.

These two statements don't match, so we eliminate (B). On the other hand, choice (A) is almost a perfect rephrasing of what the author has written.

I hope this helps!
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Determining whether a given population of animals constitutes a  [#permalink]

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New post 31 Dec 2018, 11:59
For Q3) Could someone explain how A is correct? In the passage the author clearly writes: "When the biological species concept is difficult to apply, some investigators use phenotype".

Difficult to apply does not mean inconclusive, so how does A make sense?

I chose D because the author writes "yet this idea can be too restrictive. First, mating between groups labeled as different species (hybridization), as often occurs in the canine family, is quite common in nature"

I understand that in D the answer says hybridization is THE way of undermining the biological species concept, but this phrasing seems to be more valid than A. Could someone explain where my thinking went wrong?

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Re: Determining whether a given population of animals constitutes a  [#permalink]

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New post 10 Jan 2019, 14:40
kchen1994 wrote:
For Q3) Could someone explain how A is correct? In the passage the author clearly writes: "When the biological species concept is difficult to apply, some investigators use phenotype".

Difficult to apply does not mean inconclusive, so how does A make sense?

I chose D because the author writes "yet this idea can be too restrictive. First, mating between groups labeled as different species (hybridization), as often occurs in the canine family, is quite common in nature"

I understand that in D the answer says hybridization is THE way of undermining the biological species concept, but this phrasing seems to be more valid than A. Could someone explain where my thinking went wrong?

GMATNinja

kchen1994, please see this post for an analysis on "difficult to apply" vs. "inconclusive" for answer choice (A).

As for answer choice (D), you are on the right track. Here is the exact wording of that answer choice:

Quote:
(D) The existence of hybrids in wild animal species is the chief factor casting doubt on the usefulness of research into reproductive compatibility as a way of classifying species.

The author mentions three separate issues with using reproductive compatibility as the basis for defining species. The author never says that one or another of those factors is more important than the others, so there is an issue with the word "chief" in the answer choice. You can eliminate answer (D) for that reason.

I hope this helps!
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