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Some anthropologists believe that the genetic homogeneity evident in

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Re: Some anthropologists believe that the genetic homogeneity evident in  [#permalink]

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New post 08 Jan 2015, 14:52
I agree with in all points, that's a great explanation. But regarding D, I think, that both D and B have the same meaning -> from which and that actually have the same meaning, and both sentences explain that an Event reduced the numbers of ..... D is just wordier than B, it also lacks THAT and AT before some time.
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Re: Some anthropologists believe that the genetic homogeneity evident in  [#permalink]

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New post 05 May 2016, 02:31
egmat
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.

I still dont get why A is not correct ?
"ing" plays 2 role first is describing the action with subject and second it can be an effect of a cause mentioned earlier in the clause.
here why cant "greatly reducing their numbers and thus our genetic variation" be an effect of " ancestors suffering from event "
It can mean " ancestors suffered from event and thus suffering from that event led to reducing their....blabla " clear cause and effect.
if "ing" can play second role clearly why one has to check for the first role "ing" plays( i.e. describing with subject) ??
If option A is incorrect it has to be some other reason.
thanks
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Re: Some anthropologists believe that the genetic homogeneity evident in  [#permalink]

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New post 05 May 2016, 08:58
deepak268 wrote:
egmat
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.

I still dont get why A is not correct ?
"ing" plays 2 role first is describing the action with subject and second it can be an effect of a cause mentioned earlier in the clause.
here why cant "greatly reducing their numbers and thus our genetic variation" be an effect of " ancestors suffering from event "
It can mean " ancestors suffered from event and thus suffering from that event led to reducing their....blabla " clear cause and effect.
if "ing" can play second role clearly why one has to check for the first role "ing" plays( i.e. describing with subject) ??
If option A is incorrect it has to be some other reason.
thanks


Without "that", the latter clause ( " at some time....greatly reduced their numbers") does not have much meaningful bearing to the first clause as the author intended. It is required to establish that the scientists believe even the latter clause and hence "that" is required to be repeated.
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Re: Some anthropologists believe that the genetic homogeneity evident in  [#permalink]

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New post 09 May 2016, 12:02
ccooley : I was wondering if you could help me with the following doubts?
1) I am having a hard time understanding how A break the parallelism and why is 'that' required to maintain it. I am referring to OG explanation here.
2) How would you define grammatically what role is dash playing here? I researched use of dash as per grammar rules but didnt find any other example similar to this question.
Thanks
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Re: Some anthropologists believe that the genetic homogeneity evident in  [#permalink]

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New post 11 Sep 2016, 05:27
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,

In the question, I can't understand WHY A is wrong? In A, didn't 'event' modify '' greatly reducing their numbers''?
In B, their indicates what? does it indicate ''anthropologists'', "people" or "ancestors
also, HOW an 'event' greatly reduced their number?
If I say:
They killed their father. [/i] Here, their is the pronoun of they. So, in the sentence B, .....event reduced their number. Here, their is plural but event is singular. I should not say that He killed their father. How the sentence matched its pronoun in B?
Thanks...
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Re: Some anthropologists believe that the genetic homogeneity evident in  [#permalink]

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New post 22 Aug 2017, 23:31
Hi GMATNinja generis GMATNinjaTwo

Can you help to differentiate between function of a hyphen and semicolon?
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Re: Some anthropologists believe that the genetic homogeneity evident in  [#permalink]

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New post 30 Mar 2018, 10:11
egmat

1. I understand that "that" is needed after the "-" in order to maintain the parallelism between " that the genetic homogeneity evident in the world's people is the result of a "population bottleneck" and "that at some time in the past our ancestors suffered an event" as the portion after the "-" simply elaborates the portion before "-" and adds some more information. Please tell me if my understanding is correct.

2. However, please explain why is ", greatly reducing their numbers" wrong as I understand that ",-ing" modifies the preceeding clause and either presents the result of the action done in the preceeding clause or describes how the action is being done in the preceeding clause. Here, we can see that "greatly reducing their numbers" clearly presents the result of "past our ancestors suffered an event". Please explain
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Re: Some anthropologists believe that the genetic homogeneity evident in  [#permalink]

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New post 28 Oct 2018, 21:36
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 -- Can we reject this option because we are joining 2 independent clauses using — ?

(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 -- usage of so that

(D) some time in the past our ancestors suffered an event from which their numbers were greatly reduced - we need a preposition with some time ; “from which” construction stands for “their numbers were greatly reduced from the event”. Clearly, the numbers were reduced not FROM the event but BY the event.

In general, “sometime” means “at some point”, and “some time” means “a period of time”.

(E) some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly, - we need a preposition with some time ; “so as to” indicates purpose. This option illogically means that the ancestors suffered with an intention to reduce their numbers.


1. Is the punctuation that follows the phrase "population bottleneck" is a hyphen or a dash? Can you list uses of both of them?

2. Can we reject option A because we are joining 2 independent clauses using — ?

3. In option A, DOES verb-ing modifier need to make sense with the subject of the preceding clauses our ancestors?

At some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation. -- here verb-ing modifier reducing does explain the entire action of preceding clause but does not make sense with the subject.

I dropped the bags onto the floor, scaring the dogs---> here I did not directly scare the dogs but my action of dropping the bags did.

As per the official question in the following link -

https://gmatclub.com/forum/between-14-0 ... l#p1868115

Between 14,000 and 8,000 b.c. the ice cap that covered northern Asia, Europe, and America began to melt, uncovering vast new areas that were to be occupied by migrating peoples moving northward.

An observation from this question is that the verb-ing ‘uncovering’ does not make sense with the subject ‘ice cap’: ice cap didn’t do the action of ‘uncovering’. ‘Uncovering of the areas’ happened on its own as a direct consequence of ‘melting’. Thus, we can learn from this question that in ‘comma+verb-ing structure’, verb-ing doesn’t need to always make sense with the subject as long as it provides a direct consequence of the action of the clause.

AjiteshArun , GMATNinja , MagooshExpert , VeritasPrepBrian, GMATGuruNY , VeritasKarishma , DmitryFarber , RonPurewal , ChiranjeevSingh , other experts - please enlighten
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Re: Some anthropologists believe that the genetic homogeneity evident in  [#permalink]

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New post 27 Jun 2019, 17:32
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:

Reducing : Is the action is still continuing (NO). So this is wrong. it reduced long back.

(B) that at some time in the past our ancestors suffered an event that greatly reduced their numbers

Correct answer: That (refer to the genetic homogeneity evident in the world's people is the result of a "population bottleneck")
2. suffered an event that greatly: So the event that is greatly reduces the number

(C) that sometime in the past our ancestors suffered an event so that their numbers were greatly reduced

so that their numbers were greatly: using of so that is wrong. No one forcibly reduced the number. As one event happened which reduced the number. So WRONG

(D) some time in the past our ancestors suffered an event from which their numbers were greatly reduced

their numbers were greatly reduced: seems like someone reduced their number.WRONG

(E) some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly,

so as to reduce their numbers greatly,: It seems like the ancestors only reduced their number. WRONG
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Re: Some anthropologists believe that the genetic homogeneity evident in  [#permalink]

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New post 15 Aug 2019, 04:51
Skywalker18 wrote:
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 -- Can we reject this option because we are joining 2 independent clauses using — ?

(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 -- usage of so that

(D) some time in the past our ancestors suffered an event from which their numbers were greatly reduced - we need a preposition with some time ; “from which” construction stands for “their numbers were greatly reduced from the event”. Clearly, the numbers were reduced not FROM the event but BY the event.

In general, “sometime” means “at some point”, and “some time” means “a period of time”.

(E) some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly, - we need a preposition with some time ; “so as to” indicates purpose. This option illogically means that the ancestors suffered with an intention to reduce their numbers.


1. Is the punctuation that follows the phrase "population bottleneck" is a hyphen or a dash? Can you list uses of both of them?

2. Can we reject option A because we are joining 2 independent clauses using — ?

3. In option A, DOES verb-ing modifier need to make sense with the subject of the preceding clauses our ancestors?

At some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation. -- here verb-ing modifier reducing does explain the entire action of preceding clause but does not make sense with the subject.

I dropped the bags onto the floor, scaring the dogs---> here I did not directly scare the dogs but my action of dropping the bags did.

As per the official question in the following link -

https://gmatclub.com/forum/between-14-0 ... l#p1868115

Between 14,000 and 8,000 b.c. the ice cap that covered northern Asia, Europe, and America began to melt, uncovering vast new areas that were to be occupied by migrating peoples moving northward.

An observation from this question is that the verb-ing ‘uncovering’ does not make sense with the subject ‘ice cap’: ice cap didn’t do the action of ‘uncovering’. ‘Uncovering of the areas’ happened on its own as a direct consequence of ‘melting’. Thus, we can learn from this question that in ‘comma+verb-ing structure’, verb-ing doesn’t need to always make sense with the subject as long as it provides a direct consequence of the action of the clause.

AjiteshArun , GMATNinja , MagooshExpert , VeritasPrepBrian, GMATGuruNY , VeritasKarishma , DmitryFarber , RonPurewal , ChiranjeevSingh , other experts - please enlighten


Dear egmat GMATNinja , MagooshExpert , VeritasPrepBrian, GMATGuruNY , VeritasKarishma , DmitryFarber , RonPurewal , ChiranjeevSingh please enlighten
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Re: Some anthropologists believe that the genetic homogeneity evident in  [#permalink]

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New post 15 Aug 2019, 07:40
hazelnut wrote:
macjas wrote:
The Official Guide for GMAT Review 2017

Practice Question
Question No.: SC 736
Page: 695

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,


From which source is this answer, please?
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Re: Some anthropologists believe that the genetic homogeneity evident in  [#permalink]

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New post 22 Sep 2019, 07:42
Deadpool3 wrote:
Skywalker18 wrote:
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 -- Can we reject this option because we are joining 2 independent clauses using — ?

(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 -- usage of so that

(D) some time in the past our ancestors suffered an event from which their numbers were greatly reduced - we need a preposition with some time ; “from which” construction stands for “their numbers were greatly reduced from the event”. Clearly, the numbers were reduced not FROM the event but BY the event.

In general, “sometime” means “at some point”, and “some time” means “a period of time”.

(E) some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly, - we need a preposition with some time ; “so as to” indicates purpose. This option illogically means that the ancestors suffered with an intention to reduce their numbers.


1. Is the punctuation that follows the phrase "population bottleneck" is a hyphen or a dash? Can you list uses of both of them?

2. Can we reject option A because we are joining 2 independent clauses using — ?

3. In option A, DOES verb-ing modifier need to make sense with the subject of the preceding clauses our ancestors?

At some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation. -- here verb-ing modifier reducing does explain the entire action of preceding clause but does not make sense with the subject.

I dropped the bags onto the floor, scaring the dogs---> here I did not directly scare the dogs but my action of dropping the bags did.

As per the official question in the following link -

https://gmatclub.com/forum/between-14-0 ... l#p1868115

Between 14,000 and 8,000 b.c. the ice cap that covered northern Asia, Europe, and America began to melt, uncovering vast new areas that were to be occupied by migrating peoples moving northward.

An observation from this question is that the verb-ing ‘uncovering’ does not make sense with the subject ‘ice cap’: ice cap didn’t do the action of ‘uncovering’. ‘Uncovering of the areas’ happened on its own as a direct consequence of ‘melting’. Thus, we can learn from this question that in ‘comma+verb-ing structure’, verb-ing doesn’t need to always make sense with the subject as long as it provides a direct consequence of the action of the clause.

AjiteshArun , GMATNinja , MagooshExpert , VeritasPrepBrian, GMATGuruNY , VeritasKarishma , DmitryFarber , RonPurewal , ChiranjeevSingh , other experts - please enlighten


Dear egmat GMATNinja , MagooshExpert , VeritasPrepBrian, GMATGuruNY , VeritasKarishma , DmitryFarber , RonPurewal , ChiranjeevSingh please enlighten


Hi GMATNinja AjiteshArun VeritasKarishma

If you can please help with the Skywalker18's above questions, specifically question 2,

Can we reject option A because we are joining 2 independent clauses using —(dash) ?

Also, I understand that in option 'A', it does not makes sense that the doer of the actions, 'suffered an event' and 'greatly reducing their numbers', is 'our ancestors' even though the 2nd action is clearly a result of the first.

Please correct me if I am wrong

Thanks
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Re: Some anthropologists believe that the genetic homogeneity evident in   [#permalink] 22 Sep 2019, 07:42

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