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A neuron needs to travel to the place in the brain

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A neuron needs to travel to the place in the brain [#permalink]

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New post 25 May 2014, 23:03
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A neuron needs to travel to a particular place in the brain to do its work. Not all neurons are successful in their journey. Scientists think that only a third reach their destination. Some cells die during the process of neuronal development. Some neurons survive the trip, but end up where they should not be. Mutations in the genes that control migration create areas of misplaced or oddly formed neurons that can cause disorders such as childhood epilepsy or mental retardation. Thus, it can be concluded that misguided neurons are partly responsible for schizophrenia and the learning disorder dyslexia.

The argument assumes which of the following?

A. A disorder in a person does not affect the mutations in the genes in that person.
B. Genetic factors are not a significant cause of disorder such as childhood epilepsy or mental retardation.
C. Two third of the neurons do not reach their destination
D. No factor other than misguided neurons has an impact on disorders.
E. People with no disorder will not have areas of misplaced neurons.
[Reveal] Spoiler: OA

Last edited by DollyS on 26 May 2014, 00:37, edited 2 times in total.
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Re: A neuron needs to travel to the place in the brain [#permalink]

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A seems good here : A disorder in a person does not affect the mutations in the genes in that person

negation of reversal causation is one of the assumptions in causal arguments
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Re: A neuron needs to travel to the place in the brain [#permalink]

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New post 26 May 2014, 22:21
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aditya8062 wrote:
A seems good here : A disorder in a person does not affect the mutations in the genes in that person

negation of reversal causation is one of the assumptions in causal arguments


Hi Aditya8062

Your explanation is very crisp and clear. :)

Thanks!
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Re: A neuron needs to travel to the place in the brain [#permalink]

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New post 26 May 2014, 22:25
Hi Folks

I was wondering if we could discuss other options as well.

Please share your views!

Thanks!
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Re: A neuron needs to travel to the place in the brain [#permalink]

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New post 26 May 2014, 23:50
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Dollysharma wrote:
Hi Folks

I was wondering if we could discuss other options as well.

Please share your views!

Thanks!



kindly tell ur specific doubt so that i can discuss that choice in particular
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Re: A neuron needs to travel to the place in the brain [#permalink]

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New post 30 May 2014, 06:55
How are "childhood epilepsy or mental retardation" connected to "schizophrenia and the learning disorder dyslexia"?
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Re: A neuron needs to travel to the place in the brain [#permalink]

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New post 22 Oct 2016, 20:46
DollyS wrote:
A neuron needs to travel to a particular place in the brain to do its work. Not all neurons are successful in their journey. Scientists think that only a third reach their destination. Some cells die during the process of neuronal development. Some neurons survive the trip, but end up where they should not be. Mutations in the genes that control migration create areas of misplaced or oddly formed neurons that can cause disorders such as childhood epilepsy or mental retardation. Thus, it can be concluded that misguided neurons are partly responsible for schizophrenia and the learning disorder dyslexia.

The argument assumes which of the following?

A. A disorder in a person does not affect the mutations in the genes in that person.
B. Genetic factors are not a significant cause of disorder such as childhood epilepsy or mental retardation.
C. Two third of the neurons do not reach their destination
D. No factor other than misguided neurons has an impact on disorders.
E. People with no disorder will not have areas of misplaced neurons.


Cause - Effect
Mutations misplace neurons -> misplaced neurons can cause disorder
reversal
disorder affects mutations
Hence A
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A neuron needs to travel to the place in the brain [#permalink]

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New post 26 Oct 2016, 19:20
Hi guys!

My analysis is below:

Conc: Misguided Ns are a "partial" a cause for Schi and the learning disorder Dys.
P1&2: Not all Ns are successful in their journey to other parts of the B to do their job.
P3: Researchers: only 1/3 of Ns reach destination.
P4: Some cells die during the development of Ns.
P5: Mut in Gs that control migration of N creates areas of misplaced or odd Ns --> cause disorders: Child E & Mental R

Pre-thinking assumptions:
-there are other partial causes (aside from misguided Ns) for disorders.
-Disorders don't have effect in Mut in Genes that creates ares of misplaced or odd N. (No reversal causation)

A) Correct!. If negated breaks the conclusion apart. Aligned with 2nd assumption
B) Irrelevant. If Genetic factors are not a significant cause of D, there might be other causes along with misguided N.
C) Incorrect. It is invalidating a premise. We have to take premises as 100% reliable information.
D) Opposite. This choice actually kind of weakens the conclusion. It says that N are the only factor affecting disorders. But, according to the argument, misguided N are partially responsible for disorders.
E) OFS. Not concern about people with no disorders. Not mention in argument. we can not assume something about this group of people

Any feedback about the Answer choices analysis??
Thanks!
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Re: A neuron needs to travel to the place in the brain [#permalink]

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New post 22 Jan 2018, 03:41
Cause & Effect argument: X causes Y (Premise) and hence X causes Z (Conclusion) what is the assumption here? - Z should not cause X

Choice C perfectly helps to break the conclusion when negated by saying it is the disorder in a person that actually affects the mutations in the genes of that person.

Just restarted my GMAT life. KUDOs please :-)
Re: A neuron needs to travel to the place in the brain   [#permalink] 22 Jan 2018, 03:41
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