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The brains of identical twins are genetically identical. [#permalink]
17 Jul 2004, 14:16
100% (00:00) correct
0% (00:00) wrong based on 1 sessions
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 twinâ€™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
103. 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 schizophrenics share many of the characteristics found in those of people without the disorder
(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
If "..definitive evidence that schizophrenia is caused by damage to the physical structure of the brain " then, we can not say that it will be determined someone will develop schizophrenia on the basis of genetic information alone.
C â€“ damage to physical structure causes schizophrenia (S) E1 â€“ In 2 identical brains when one has S certain areas of brain are smaller
E3 â€“ no difference when no S in identical brains
A â€“ we donâ€™t know it could be true that one who is genetically not prone to S will not develop S
B- we donâ€™t know it could be true that medication could control the symptoms of S
C- we donâ€™t know it could be true that brains of S may share many characteristics with normal people
E- we don't know it could be true that childhood infections could cause S
D - Finally it will be possible to find if someone will develop S from genetic information only.
I chose D because it strongly states that S will be developed only on the basis of genetic information. This statement is â€œfalseâ€
It's an except question, IMO (A) should be the answer.
I feel (D) is wrong, because in the argument size of brain of twins is compared, now by doing this it might be possible that in future using this small size as basis of measurement we can determine whether a person suffers from Schizophrenia