Identical twins tend to have similar personalities; if : GMAT Critical Reasoning (CR)
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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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27 Dec 2005, 09:01
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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 studyâ€™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
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27 Dec 2005, 10:15
I will go with C.

Premise: Trait X is due to Heridity. Trait Y is due to environment.
Assumption: A given trait is ENTIRELY due to EITHER heridity OR environment. (Mutually Exclusive)

(A) Fewer than half of the pairs of twins studied were raised separately. --> If the assumption above is accepted, the size of the group doesn't matter.
(B) The ages of all of the twins studied fell within a 10-year range. --> Out of scope (OOS) - Age doesn't matter-
(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. --> ATTACKS MY ASSUMPTION. MY ARGUMET IS FALLING APART! HELP!
(D) Although over half the traits measured were determined to be linked to heredity, the nature of those traits varied widely. --> OOS - Nature of the traits is not an issue
(E) The 11 traits that were measured constitute a representative sample of larger, generally accepted pool of key personality traits ---> OOS - Type of trait is not an issue.
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27 Dec 2005, 12:18
Agree with C.
27 Dec 2005, 12:18
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