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# All Y-chromosomes in existence today are descended

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Manager
Joined: 15 Apr 2016
Posts: 83
All Y-chromosomes in existence today are descended [#permalink]

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23 Dec 2016, 07:30
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Question Stats:

72% (00:33) correct 28% (00:39) wrong based on 279 sessions

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All Y-chromosomes in existence today are descended from a single ancestor’s who is thought to have lived about 140,000 years ago.

A. a single ancestor’s who is thought to have lived

B. a single ancestor’s who was thought to live

C. a single ancestor whom it is thought had lived

D. the Y chromosome of a single ancestor who is thought to have lived

E .the Y chromosome of a single ancestor whom it was thought had lived
[Reveal] Spoiler: OA

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Joined: 01 Sep 2010
Posts: 3416
Re: All Y-chromosomes in existence today are descended [#permalink]

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23 Dec 2016, 09:44
Top Contributor
Tough one and tricky

The first 3 choices are weird also ancestor’s who or ancestor’s whom refer to which antecedent ??

E is good but after becomes convoluted and a mess whom it was thought had lived

D remains

Hope this helps
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Manager
Joined: 11 Jul 2012
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GMAT 1: 650 Q49 V29
Re: All Y-chromosomes in existence today are descended [#permalink]

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23 Dec 2016, 22:11
Final two were between A and D......what is wrong with option A?
Director
Affiliations: CrackVerbal
Joined: 03 Oct 2013
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GMAT 1: 780 Q51 V46
Re: All Y-chromosomes in existence today are descended [#permalink]

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24 Dec 2016, 01:11
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let us analyze each of the answer options -

A - "a single ancestor's" what? this answer option does not answer the question.

B - "a single ancestor's" what?

the "who" refers to "ancestor's". It should have referred to ancestor.
Also, we need the present tense here - 'who was thought to live'; the "thinking" is still true. so, the subordinate clause should read - "who is thought to have lived".

C - it makes more sense to say that the chromosomes today descended from another chromosome.
We need to use "who" not "whom"; Whom is used to refer to objects whereas who refers to subjects.

For example -
Who likes some pizza? (He does)
Whom do you believe? (I cannot say "he"; I say - I believe him).

the usage of "it" is incorrect as it does not refer to anything.
Also, the usage of past perfect is incorrect. We are referring to a specific time - 140,000 years ago. We use the past tense in such cases.

D - correct answer.
Note the sequence of tenses used here -
"who is thought to have lived 140,000 years ago" - the thinking is in the present.
to + past participle suggests that the action occurred before the preceding verb. Hence, this correctly suggests that "living" occurred before "thinking".

E - "whom it was thought had lived"

the usage of whom is incorrect.
Also, the present tense "is thought" is better here.
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Joined: 28 May 2014
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Re: All Y-chromosomes in existence today are descended [#permalink]

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15 Nov 2017, 21:17
is had lived wrong here in option E?
Re: All Y-chromosomes in existence today are descended   [#permalink] 15 Nov 2017, 21:17
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# All Y-chromosomes in existence today are descended

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