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Some anthropologists believe that the genetic homogeneity

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Some anthropologists believe that the genetic homogeneity [#permalink] New post 22 Jun 2012, 01:28
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Some anthropologists believe that the genetic homogeneity evident in the world's people is the result of a "population bottleneck"-at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.

A at some time in the past our ancestors suffered an event, greatly reducing their numbers
B that at some time in the past our ancestors suffered an event that greatly reduced their numbers
C that sometime in the past our ancestors suffered an event so that their numbers were greatly reduced
D some time in the past our ancestors suffered an event from which their numbers were greatly reduced
E some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly,
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Re: Some anthropologists believe that the genetic homogeneity ev [#permalink] New post 22 Jun 2012, 05:58
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A at some time in the past our ancestors suffered an event, greatly reducing their numbers ------ A hyphen is not the tool to connect two ICs.
B that at some time in the past our ancestors suffered an event that greatly reduced their numbers -------- ‘that ’ is the right connector ---correct choice.
C that sometime in the past our ancestors suffered an event so that their numbers were greatly reduced ------- altered notion; it looks as if the ancestors suffered a calamity in order to reduce their numbers.
D some time in the past our ancestors suffered an event from which their numbers were greatly reduced -------- conjugation of two ICs with hyphenation is wrong.
E some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly, ------ same as in D

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Re: Some anthropologists believe that the genetic homogeneity ev [#permalink] New post 22 Jun 2012, 21:48
that at some time - Does this sound ok??
I thought its awkward so chose C. :(
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Re: Some anthropologists believe that the genetic homogeneity ev [#permalink] New post 25 Jun 2012, 20:12
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In answer choice (A) there is a problem with modification. (A) is implying that our ancestors greatly reduced their own numbers (this is incorrect because it was the event that greatly reduced ancestors). When we have an independent clause followed by a participle phrase (one that starts with a gerund and serves as an adjective clause), the participle phrase modifies the subject of the sentence.

In non-grammarese: 'ancestors' is the subject of the independent clause, 'at some time...' and because of the comma after event, we have the incorrect meaning. It was not the ancestors but an event that 'reduced their numbers.'

Therefore, we want to make sure that it is clear that 'event' is 'greatly reducing the numbers.' One way to fix that is by using the relative pronoun 'that.' In (B), we have 'an event that greatly reduced their numbers' that does a good job of correcting the error in (A).

Therefore (B) is the answer.
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Re: Some anthropologists believe that the genetic homogeneity ev [#permalink] New post 25 Sep 2012, 09:27
ChrisLele wrote:
In answer choice (A) there is a problem with modification. (A) is implying that our ancestors greatly reduced their own numbers (this is incorrect because it was the event that greatly reduced ancestors). When we have an independent clause followed by a participle phrase (one that starts with a gerund and serves as an adjective clause), the participle phrase modifies the subject of the sentence.

In non-grammarese: 'ancestors' is the subject of the independent clause, 'at some time...' and because of the comma after event, we have the incorrect meaning. It was not the ancestors but an event that 'reduced their numbers.'

Therefore, we want to make sure that it is clear that 'event' is 'greatly reducing the numbers.' One way to fix that is by using the relative pronoun 'that.' In (B), we have 'an event that greatly reduced their numbers' that does a good job of correcting the error in (A).

Therefore (B) is the answer.


Use of 'that' in 'that greatly reduced their numbers" sounds good as you explained but how's the use of 'that' in "that at some time in the past.." justified. Please explain.
If "that at some time in the past.." were parallel to "that the genetic homogeneity..", shouldn't the sentence rather look like:
Some people believe that X and that Y.
The sentence as it looks to me actually is like this:
Some people believe something population bottleneck - definition of population bottleneck.

I rejected option B because 'that' in 'that at some time in the past...' sounded awkward and I got the question wrong :(
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Re: Some anthropologists believe that the genetic homogeneity ev [#permalink] New post 25 Sep 2012, 22:21
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divineacclivity wrote:
ChrisLele wrote:
In answer choice (A) there is a problem with modification. (A) is implying that our ancestors greatly reduced their own numbers (this is incorrect because it was the event that greatly reduced ancestors). When we have an independent clause followed by a participle phrase (one that starts with a gerund and serves as an adjective clause), the participle phrase modifies the subject of the sentence.

In non-grammarese: 'ancestors' is the subject of the independent clause, 'at some time...' and because of the comma after event, we have the incorrect meaning. It was not the ancestors but an event that 'reduced their numbers.'

Therefore, we want to make sure that it is clear that 'event' is 'greatly reducing the numbers.' One way to fix that is by using the relative pronoun 'that.' In (B), we have 'an event that greatly reduced their numbers' that does a good job of correcting the error in (A).

Therefore (B) is the answer.


Use of 'that' in 'that greatly reduced their numbers" sounds good as you explained but how's the use of 'that' in "that at some time in the past.." justified. Please explain.
If "that at some time in the past.." were parallel to "that the genetic homogeneity..", shouldn't the sentence rather look like:
Some people believe that X and that Y.
The sentence as it looks to me actually is like this:
Some people believe something population bottleneck - definition of population bottleneck.

I rejected option B because 'that' in 'that at some time in the past...' sounded awkward and I got the question wrong :(


I had thought on the same lines initially (that X and that Y) - but closely looking at these two choices you would notice there is a clear change of meaning in the second choice (C)

we can replace 2nd "that" in B with "which" and sentence makes same sense. so its not ( that X and that Y)
B that at some time in the past our ancestors suffered an event that greatly reduced their numbers

"so that" in this means "because of". It conveys as if the ancestors suffered an event to cause a reduction in their own numbers.
C that sometime in the past our ancestors suffered an event so that their numbers were greatly reduced

Hope it makes sense.
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Re: Some anthropologists believe that the genetic homogeneity [#permalink] New post 31 Oct 2012, 22:14
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COMMA + VERBing should refer to the SUBJECT of the preceding clause. In A, reducing seems to refer to our ancestors, implying that OUR ANCESTORS were greatly reducing their numbers. The intended meaning here is that an EVENT greatly reduced their numbers. Eliminate A.

So that (in C) and so as (in E) imply PURPOSE. The result is a strange meaning: that our ancestors suffered for the PURPOSE of reducing their numbers. Not the intended meaning. Eliminate C and E.

In D, which seems to refer to an event, implying that our ancestors' numbers were reduced FROM an event -- a nonsensical meaning. Eliminate D.

The correct answer is B.
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Re: Some anthropologists believe that the genetic homogeneity [#permalink] New post 17 Apr 2013, 23:49
Thanks a Lot PUNEETSCHDV :) U saved my day... this is the best explanation of the question available....

There are two pending items that need to be discussed in detail.
Usage of '--' and ' at some time'




Can some guru confirm if below points are correct:


some time: Unspecific time . I want to visit chicago sometime this year
At some time in the past : during some indefinite time in the past
at sometime in the past: same as above
some time: some is an adjective referring to time, quite a while
I’ve been spending some time thinking about income inequality for a piece I’m writing.
sometimes : occasionally

some time in the past -> is wrong ??


Regarding usage of '--':
Check the below link from grockit:
http://grockit.com/blog/gmat/2011/08/01/gmat-sentence-corrections-colons-and-dashes/
So if i interpret it correctly 'DASH'es quite flexible, so "-that at some time in the past " is same as "-at some time in the past"...
can some one confirm this..
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Re: Some anthropologists believe that the genetic homogeneity ev [#permalink] New post 09 May 2013, 21:32
ChrisLele wrote:
In answer choice (A) there is a problem with modification. (A) is implying that our ancestors greatly reduced their own numbers (this is incorrect because it was the event that greatly reduced ancestors). When we have an independent clause followed by a participle phrase (one that starts with a gerund and serves as an adjective clause), the participle phrase modifies the subject of the sentence.

In non-grammarese: 'ancestors' is the subject of the independent clause, 'at some time...' and because of the comma after event, we have the incorrect meaning. It was not the ancestors but an event that 'reduced their numbers.'

Therefore, we want to make sure that it is clear that 'event' is 'greatly reducing the numbers.' One way to fix that is by using the relative pronoun 'that.' In (B), we have 'an event that greatly reduced their numbers' that does a good job of correcting the error in (A).

Therefore (B) is the answer.


I would like to contradict your explanation of -ING modifiers:

-ING can be used as

(1). Progressive tense : Rita is PLAYING
(2). Gerund: SWIMMING is a good exercise
(3). Adjective: The CAT SLEEPING on the mat is ill
(4). Adverb: Rita failed in the exam,forcing her to commit suicide

In the sentence (4). -ING is used as an adverb which adds to VERB "Failed" an Action.Moreover, there lies no confusion between "Ancestors" or "event" as to what -ING is referring to.However, the problem here is solely with the "SUFFERING".

SUFFERING never caused => reducing in number

"which" would have been appropriate here.

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Re: Some anthropologists believe that the genetic homogeneity ev [#permalink] New post 09 May 2013, 23:26
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(4). Adverb: Rita failed in the exam,forcing her to commit suicide

Can you see if you can post an official example where above kind of construct is valid. It would be interesting to see.

targetgmatchotu wrote:
Moreover, there lies no confusion between "Ancestors" or "event" as to what -ING is referring to.

Actually if you read the OE (this is a OG question), it says: The agent or cause of reducing is unclear.
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Re: Some anthropologists believe that the genetic homogeneity ev [#permalink] New post 10 May 2013, 05:22
EducationAisle wrote:
targetgmatchotu wrote:
(4). Adverb: Rita failed in the exam,forcing her to commit suicide

Can you see if you can post an official example where above kind of construct is valid. It would be interesting to see.

targetgmatchotu wrote:
Moreover, there lies no confusion between "Ancestors" or "event" as to what -ING is referring to.

Actually if you read the OE (this is a OG question), it says: The agent or cause of reducing is unclear.


Sir,

As requested , here it is from MGMAT SC GUIDE.

Verb (Progressive Tense)
Noun (Gerund)
Adjective (Present Participle)
Adverb (Present Participle)

She is FIXINGthe faucet.
FIXINGthe faucet is not fun.
The person FIXINGthe faucet is tired.
She crouched under the sink, FIXINGthe faucet.

Just copy pasted didn't align it ,apologies for the same.


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Re: Some anthropologists believe that the genetic homogeneity [#permalink] New post 10 May 2013, 06:16
Sure no problem; when I had requested:

Can you see if you can post an official example where above kind of construct is valid.

By official example I meant questions from Official guides, GMATPreps etc. (these are called "official sources"), not MGMAT guides.
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Re: Some anthropologists believe that the genetic homogeneity [#permalink] New post 10 May 2013, 06:44
EducationAisle wrote:
Sure no problem; when I had requested:

Can you see if you can post an official example where above kind of construct is valid.

By official example I meant questions from Official guides, GMATPreps etc. (these are called "official sources"), not MGMAT guides.



Sir,

I have been practicing from OG's these days.Whenever I will face a problem based on this will surely put up here.

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Re: Some anthropologists believe that the genetic homogeneity ev [#permalink] New post 14 Jun 2013, 04:40
ChrisLele wrote:
In answer choice (A) there is a problem with modification. (A) is implying that our ancestors greatly reduced their own numbers (this is incorrect because it was the event that greatly reduced ancestors). When we have an independent clause followed by a participle phrase (one that starts with a gerund and serves as an adjective clause), the participle phrase modifies the subject of the sentence.

In non-grammarese: 'ancestors' is the subject of the independent clause, 'at some time...' and because of the comma after event, we have the incorrect meaning. It was not the ancestors but an event that 'reduced their numbers.'

Therefore, we want to make sure that it is clear that 'event' is 'greatly reducing the numbers.' One way to fix that is by using the relative pronoun 'that.' In (B), we have 'an event that greatly reduced their numbers' that does a good job of correcting the error in (A).

Therefore (B) is the answer.


Hi,
I am bit confused about your explanation, I thought that a participle phrase (gerund) will modify the entire independent clause - in this case the fact that "our ancestors suffered an event"
Example (Taken from MGMAT just to make sure I don't introduce something estrange):
Crime has recently decreased in our neighborhood, leading to a rise in property values

I may be missing something in your explanation, so it will be great if you can expand a bit more on it.

I originally had chosen A, not thinking about the required parallelism: Anthropologist believed that x - that y. I didn't think it made sense to make those two clauses parallel because of the lack of 'and', and thus I figured that the clause after the dash ('=') was just emphasizing the definition of a 'population bottleneck'.

I hope this thread is not to old.

Thanks,
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Re: Some anthropologists believe that the genetic homogeneity [#permalink] New post 08 Jul 2013, 04:38
Can some one explain use of from which??
Please quote some examples when to use that and fro which?
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Re: Some anthropologists believe that the genetic homogeneity [#permalink] New post 28 Oct 2013, 06:35
e-Gmat-
could you please explain why D is wrong? is it just because of "-" and IC.

Thanks
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Re: Some anthropologists believe that the genetic homogeneity [#permalink] New post 10 Nov 2013, 11:46
skamal7 wrote:
Can some one explain use of from which??
Please quote some examples when to use that and fro which?


Hi skamal7,

Check out my response here: the-criminologist-reported-that-it-is-not-uncommon-for-134387.html#p1283384
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Re: Some anthropologists believe that the genetic homogeneity [#permalink] New post 10 Nov 2013, 11:49
macjas wrote:
Some anthropologists believe that the genetic homogeneity evident in the world's people is the result of a "population bottleneck"-at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.

A at some time in the past our ancestors suffered an event, greatly reducing their numbers
B that at some time in the past our ancestors suffered an event that greatly reduced their numbers
C that sometime in the past our ancestors suffered an event so that their numbers were greatly reduced
D some time in the past our ancestors suffered an event from which their numbers were greatly reduced
E some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly,


Should the dash be underlined in A as well? Or am I missing something?
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Re: Some anthropologists believe that the genetic homogeneity [#permalink] New post 27 Nov 2013, 20:58
macjas wrote:
Some anthropologists believe that the genetic homogeneity evident in the world's people is the result of a "population bottleneck"-at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.

A at some time in the past our ancestors suffered an event, greatly reducing their numbers
B that at some time in the past our ancestors suffered an event that greatly reduced their numbers
C that sometime in the past our ancestors suffered an event so that their numbers were greatly reduced
D some time in the past our ancestors suffered an event from which their numbers were greatly reduced
E some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly,


according the "oxford advanced learners' dictionary", "so that" can be used to show purpose and result.

in c, if "so that " is used to show purpose, it is not logic. if "so that" is used to show result, it is not good because there is no "strong adjective" to use "so that". if we have "ancestors suffered an terrible event so that..." , c can be correct. and clearly, the intended meaning is "event causes reducing" .
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Re: Some anthropologists believe that the genetic homogeneity [#permalink] New post 23 Dec 2013, 22:29
This question can be solved by identifying two easy splits:
- Believe X - Believe X: the two X's should be parallel - "That the genetic..." should be parallel with " that at some time..."
Eliminate A, D & E
- "at some time" vs. "some time": we require a definite period of time, at some time answers the question "when? at some time"; A would have been correct if we had "sometime" instead of "some time"
Eliminate C

Answer: B
Re: Some anthropologists believe that the genetic homogeneity   [#permalink] 23 Dec 2013, 22:29
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