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When a female fruit fly is placed in a cage with several

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When a female fruit fly is placed in a cage with several [#permalink] New post 14 Jun 2010, 06:32
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When a female fruit fly is placed in a cage with several potential mates, her offspring tend to be stronger than when she is caged with only a single male of average strength. Therefore, the female fruit fly must be able to determine which mate will give her the strongest offspring.
which of the following, if true, is the best basis for a counter-argument against the conclusion drawn above?

A The offspring also tend to be stronger when, in a cage containing several female and male fruit flies, the males vary widely in strength and size, from the very small and weak to a very large and strong

B Given a choice between a male fruit fly of average strength and relatively weak male fruit fly, the female will mate with the male of average strength

C When caged with just one male fruit fly of average strength, the female produces no fewer offsping than when caged with a variety of potential males.

D Strong male flies produce stronger offspring than do weak male fruit flies, provided that both are mated to females of equal strngth

E In a cage containing several male fruit flies, the strongest male does not allow the female to mate with any of the other males.
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Re: female fruit fly [#permalink] New post 14 Jun 2010, 06:51
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Re: female fruit fly [#permalink] New post 14 Jun 2010, 07:15
nusmavrik wrote:
When a female fruit fly is placed in a cage with several potential mates, her offspring tend to be stronger than when she is caged with only a single male of average strength. Therefore, the female fruit fly must be able to determine which mate will give her the strongest offspring.
which of the following, if true, is the best basis for a counter-argument against the conclusion drawn above?

A The offspring also tend to be stronger when, in a cage containing several female and male fruit flies, the males vary widely in strength and size, from the very small and weak to a very large and strong

B Given a choice between a male fruit fly of average strength and relatively weak male fruit fly, the female will mate with the male of average strength

C When caged with just one male fruit fly of average strength, the female produces no fewer offsping than when caged with a variety of potential males.

D Strong male flies produce stronger offspring than do weak male fruit flies, provided that both are mated to females of equal strngth

E In a cage containing several male fruit flies, the strongest male does not allow the female to mate with any of the other males.


IMO E,
If the strongest male does not allow the female to mate with any other male then the conclusion that
"the female fruit fly must be able to determine which mate will give her the strongest offspring." - is counter attacked.
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Re: female fruit fly [#permalink] New post 17 Jun 2010, 10:01
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Hussain15 wrote:
IMO
"B"


Conclusion: the female fruit fly must be able to determine which mate will give her the strongest offspring.

B actually strengthens the conclusion by confirming that female prefers stronger mate ..... so it is not what we're looking for.

nusmavrik wrote:
When a female fruit fly is placed in a cage with several potential mates, her offspring tend to be stronger than when she is caged with only a single male of average strength. Therefore, the female fruit fly must be able to determine which mate will give her the strongest offspring.
which of the following, if true, is the best basis for a counter-argument against the conclusion drawn above?

E In a cage containing several male fruit flies, the strongest male does not allow the female to mate with any of the other males.



this argument is an example of cause & effect ... the question belongs to 'causality and weaken questions' sub-topic of CR.

if you see a causal conclusion (like we have in this argument), then more often than never, the reasoning is flawed.

the problem with a causal conclusion is that it takes information from two or more premises and draws a conclusion based on that. and usually such an approach has gaps of reasoning.

Premise: In Europe, people jog a lot.
Premise: There's a high frequency of Asthma in Europe.
Conclusion: So, jogging a lot causes Asthma.

you can see the flawed reasoning in the causal conclusion.

E is correct because it negates the conclusion.
strongest male does not allow female to mate with anyone else. so it is not the female who chooses her mate (relationship is reversed and the conclusion is weakened).

HTH

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Re: female fruit fly [#permalink] New post 17 Jun 2010, 20:22
OA is E

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Re: female fruit fly [#permalink] New post 23 Jun 2010, 17:47
E for me.

It is not the female fly who determines which mate will give the strongest offspring but it is the strongest male fly who does not allow the female to mate with anyone else.
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Re: female fruit fly [#permalink] New post 23 Jun 2010, 19:23
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Re: female fruit fly [#permalink] New post 24 Jun 2010, 13:06
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Re: female fruit fly   [#permalink] 24 Jun 2010, 13:06
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