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The brains of identical twins are genetically identical.

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Director
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The brains of identical twins are genetically identical. [#permalink] New post 06 Dec 2006, 04:58
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A
B
C
D
E

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The brains of identical twins are genetically identical. When only one of a pair of identical twins is a schizophrenic, certain areas of the affected twin’s brain are smaller than corresponding areas in the brain of the unaffected twin. No such differences are found when neither twin is schizophrenic. Therefore, this discovery provides definitive evidence that schizophrenia is caused by damage to the physical structure of the brain.

If the statements on which the conclusion above is based are all true, each of the following could be true EXCEPT:
(A) People who lack a genetic susceptibility for the disease will not develop schizophrenia.
(B) Medications can control most of the symptoms of schizophrenia in most patients but will never be able to cure it.
(C) The brains of schizophrenics share many of the characteristics found in those of people without the disorder.
(D) It will eventually be possible to determine whether or not someone will develop schizophrenia on the basis of genetic information alone.
(E) Brain abnormalities associated with schizophrenia are the result of childhood viral infections that inhibit the development of brain cells.

Please give reason for ur choice...
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 [#permalink] New post 06 Dec 2006, 05:21
Hmmm would choose A...

If the brain of the identical twins is genetically identical, how come then one develops the disease and the other does not.....
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 [#permalink] New post 06 Dec 2006, 06:41
Phew! gor for D

if genetic is the only one factor(does not contradict the argument, the desease not necessarily occuring at the same time) -> then A true and D true -> no answer possible

if genetic is not the only factor -> then A true and D false
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 [#permalink] New post 06 Dec 2006, 06:57
D for me too.

the twins in the passage have identical genes. so in D, if u know the genes are the same, u can't decide.
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Re: CR-twins [#permalink] New post 06 Dec 2006, 07:48
The brains of identical twins are genetically identical. When only one of a pair of identical twins is a schizophrenic, certain areas of the affected twin’s brain are smaller than corresponding areas in the brain of the unaffected twin. No such differences are found when neither twin is schizophrenic. Therefore, this discovery provides definitive evidence that schizophrenia is caused by damage to the physical structure of the brain.

If the statements on which the conclusion above is based are all true, each of the following could be true EXCEPT:
(A) People who lack a genetic susceptibility for the disease will not develop schizophrenia.

I would bet on A too. The argument says that "this discovery provides definitive evidence that schizophrenia is caused by damage to the physical structure of the brain". We have to assume that it is true, because question says so. If an accident is causing that, then the disease can occur to people who lack a genetic susceptibility also.

(B) Medications can control most of the symptoms of schizophrenia in most patients but will never be able to cure it.
(C) The brains of schizophrenics share many of the characteristics found in those of people without the disorder.
(D) It will eventually be possible to determine whether or not someone will develop schizophrenia on the basis of genetic information alone.

How can we say that it is impossible? The question asks whether it is possible. Determining based on genetic information alone could be possible one day. No body knows the limits of genetics.:lol:

(E) Brain abnormalities associated with schizophrenia are the result of childhood viral infections that inhibit the development of brain cells.

Please give reason for ur choice...
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 [#permalink] New post 06 Dec 2006, 10:43
tennis_ball wrote:
D for me too.

the twins in the passage have identical genes. so in D, if u know the genes are the same, u can't decide.


Good explaination. Agree with D
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 [#permalink] New post 06 Dec 2006, 20:38
D too
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 [#permalink] New post 06 Dec 2006, 21:02
Identical twins are genetically identical still one of them develops schizophrenia the other does not. Therefore, by examining the genetic pattern, it is not possible to predict whether someone will develop schizophrenia.

D !
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 [#permalink] New post 07 Dec 2006, 02:16
Thanks guys...the OA is D.
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 [#permalink] New post 07 Dec 2006, 08:34
Late but D.
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Re: CR-twins [#permalink] New post 07 Dec 2006, 16:30
D states that it'll be possible to det likeliness to develop schizophrenia based only on the genes, contradicting the premises.
Re: CR-twins   [#permalink] 07 Dec 2006, 16:30
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