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# Identical twins tend to have similar personalities; if

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Identical twins tend to have similar personalities; if [#permalink]

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20 Jul 2008, 04:18
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Identical twins tend to have similar personalities; if environment outweighs heredity in personality development, twins raised together should presumably have more similar personalities than those raised apart. A recent study of identical twins in both situations measured 11 key traits through a questionnaire, and concluded that 7 of the 11 are primarily products of heredity.

Which of the following, if established, would cast the most doubt on the study's results?

(A) Fewer than half of the pairs of twins studied were raised separately.
B The ages of all of the twins studied fell within a 10-year range.
(C Some of the traits that the study attributed to heredity developed in the
separately raised twins because those pairs all grew up in similar families.
(D) Although over half the traits measured were determined to be linked to
heredity, the nature of those traits varied widely.
(E) The 11 traits that were measured constitute a representative sample of larger,
generally accepted pool of key personality traits.

I understand the case as two twin group is different when evaluating the traits' result and therefore I made D the OA is C but how can it be?
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20 Jul 2008, 05:33
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perfectstranger wrote:
Identical twins tend to have similar personalities; if environment outweighs heredity in personality development, twins raised together should presumably have more similar personalities than those raised apart. A recent study of identical twins in both situations measured 11 key traits through a questionnaire, and concluded that 7 of the 11 are primarily products of heredity.

Which of the following, if established, would cast the most doubt on the study's results?

(A) Fewer than half of the pairs of twins studied were raised separately.
B The ages of all of the twins studied fell within a 10-year range.
(C Some of the traits that the study attributed to heredity developed in the
separately raised twins because those pairs all grew up in similar families.
(D) Although over half the traits measured were determined to be linked to
heredity, the nature of those traits varied widely.
(E) The 11 traits that were measured constitute a representative sample of larger,
generally accepted pool of key personality traits.

I understand the case as two twin group is different when evaluating the traits' result and therefore I made D the OA is C but how can it be?

Premise: If environment is main factor, twins raised together have more similarities than those raised apart.
Premise: study measured 11 traits
Conclusion: 7 out of 11 are product of heredity

So, in both the cases results show some similarities that conclude about "heredity". To weaken the conclusion we have to show that it is not heredity but some similarities in families or environment where the twins are grown up.

(A)WRONG: Fewer than half of the pairs of twins studied were raised separately. -- but do not provide info about family
(B) WRONG: The ages of all of the twins studied fell within a 10-year range. -- Still NO info about family
(C) CORRECT: Some of the traits that the study attributed to heredity developed in the
separately raised twins because those pairs all grew up in similar families. -- tell about family type
(D) WRONG: Although over half the traits measured were determined to be linked to
heredity, the nature of those traits varied widely. -- strengthen the conclusion as saying that linked to heredity
(E) WRONG: The 11 traits that were measured constitute a representative sample of larger,
generally accepted pool of key personality traits. -- question traits are not weakening the heredity pattern
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20 Jul 2008, 09:23
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Which of the following, if established, would cast the most doubt on the study's results?

What are the results of the study?

concluded that 7 of the 11 are primarily products of heredity.

A correct answer choice that casts most doubt on the study's results? would say some thing like

(a) Heredity is not the cause for these traits

(b) Environment probably is the cause for these traits.

(c) both a & b

Ans (C) exactly does that. C says two different twins raised in different families have the same traits because the environment in which they are brought up is similar and not because they share the genetic composition
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20 Jul 2008, 09:49
C is correct
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02 Nov 2009, 03:50
I fail to understand why A is not the answer. It says that fewer than half of the pairs of twins were raised separately. So, let us say the study involved 100 pairs identical twins and only 1 pair of identical twin was raised separately. In such a case, the finding of the study (that traits are more a product of heredity than environment) could be wrong, since the environment of 99 pairs of twins was the same.

Can someone please explain. Sorry I am picking this thread after such a long time.
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03 Jun 2010, 23:40
Let me try to explain: It is cause and effect problem.

Study's result: 7/11 are primary products of heredity.
Doubt: 7/11 are not primary products of heredity. There are other factors for the similarities.

This is what C says that it is the environment rather than heredity.

A says that - Fewer than half of the pairs of twins studied were raised separately.
It is half right, but it is missing on other contributing factors.

mohish wrote:
I fail to understand why A is not the answer. It says that fewer than half of the pairs of twins were raised separately. So, let us say the study involved 100 pairs identical twins and only 1 pair of identical twin was raised separately. In such a case, the finding of the study (that traits are more a product of heredity than environment) could be wrong, since the environment of 99 pairs of twins was the same.

Can someone please explain. Sorry I am picking this thread after such a long time.

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07 Jun 2010, 10:40
i agree with C. good explanations by ykaiim and priyankur_saha
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21 Nov 2010, 02:44
'priyankur_saha@ml.com' +1 kudos to you for the excellent explanation.
and for the nice signature line - "If You're Not Living On The Edge, You're Taking Up Too Much Space."
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Re: Identical twins tend to have similar personalities; if [#permalink]

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11 Oct 2013, 00:47
Hello from the GMAT Club VerbalBot!

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Re: Identical twins tend to have similar personalities; if [#permalink]

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23 Jul 2016, 11:34
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: Identical twins tend to have similar personalities; if   [#permalink] 23 Jul 2016, 11:34
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# Identical twins tend to have similar personalities; if

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