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Some anthropologists believe that the genetic homogeneity

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

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New post 13 Jan 2018, 08:14
egmat wrote:
SidKaria 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 some time in the past our ancestors suffered an even 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 even so as to reduce their numbers greatly



i have 2 doubts in this question
1)that greatly reduced their numbers and thus our genetic variation.
how is this parallel ?? that.... numbers is an IC, clause while the 2nd part is a phrase.
please help.

2)OG says that at some time or adverb sometime is needed and some time in option c is incorrect.

can u please explain why is it so ??


Hi Sid,

Thanks for your posting your doubt here. :-)

This is the structure of Choice B: ...at some time in the past our ancestors suffered an event that greatly reduced
a. their numbers and
b. thus our genetic variation

The noun entities "their numbers" and "our genetic variation" are grammatically parallel to each other. Now, "thus" is an adverb, a modifier, that presents the effect of an action. It's placement before the second entity DOS NOT violate the grammatical parallelism in any way. Hence, the parallelism is all correct in Choice B.

Now, "sometime" is not the same as "some time". The former means "at some point in time" while the other means "a little time". Let's take two very simple examples here:

1. Sometimes, i visit the public library.
2. Please give me some time to finish this question.

That's the reason why "some time" is incorrect in Choice C.

Hope this helps. :-)
Thanks.
SJ



Hi Payal ,

I am having little confusion with dash .
The example given by you .
Mariana believes that altruism exists even in today’s day and age — that people can help others without any selfish motives is not an idea that is too unrealistic to exist in a society that thrives on rewarding individualism.

the sentence after dah 'that people can ....' tells more about beleif mariana has ?
can we write it as
Mariana believes that altruism exists even in today’s day and age , and Mariana believes that people can help others without any selfish motives is not an idea that is too unrealistic to exist in a society that thrives on rewarding individualism .

basically dash is telling what marina beliefs is .
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Re: Some anthropologists believe that the genetic homogeneity [#permalink]

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New post 15 Jan 2018, 11:04
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,


Is hyphen underlined or not ? :?
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Re: Some anthropologists believe that the genetic homogeneity [#permalink]

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New post 31 Jan 2018, 05:37
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 [#permalink]

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New post 31 Jan 2018, 05:42
Hi GMATNinja generis GMATNinjaTwo

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

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New post 31 Jan 2018, 20:21
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dave13 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,


Is hyphen underlined or not ? :?



Hello dave13,

Just to confirm, the dash (hyphens are smaller) in this official sentence is NOT underlined.


Thanks. :-)
Shraddha
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Re: Some anthropologists believe that the genetic homogeneity [#permalink]

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New post 31 Jan 2018, 20:29
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adkikani wrote:
Hi GMATNinja generis GMATNinjaTwo

Can you help to differentiate between function of a hyphen and semicolon?



Hello Arpit @adikikani,

I will be glad to help you out with this one. :-)


To begin with, this official sentence uses a dash and not a hyphen.

Now generally, both hyphens and semi-colons are used to connect two independent clauses.

However, in the correct answer choice of this official question, the hyphen is followed by a dependent clause.

Personally, I see this usage just as an exception to the rule, an atypical usage in a one-off case.


Hope this helps. :-)
Thanks.
Shraddha
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Some anthropologists believe that the genetic homogeneity [#permalink]

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New post 03 Feb 2018, 14:03
Comma+Ving will modify the nearest subject which is Ancestor in A. Hence, incorrect.

Comma+Ving can be the logical outcome of preceding clause, however not in this case. Because "scientist believed...." is NOT the logical outcome of reduced population. It is "the event" that reduces the population.
Some anthropologists believe that the genetic homogeneity   [#permalink] 03 Feb 2018, 14:03

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