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Loggerhead turtles live and breed in distinct groups,of whic

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Loggerhead turtles live and breed in distinct groups,of whic [#permalink]

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New post 10 May 2014, 00:32
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  65% (hard)

Question Stats:

61% (01:43) correct 39% (02:01) wrong based on 365 sessions

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Loggerhead turtles live and breed in distinct groups,of which some are in the Pacific Ocean and some are in the Atlantic. New evidence suggests that juvenile Pacific loggerheads that feed near the Baja peninsula hatch in Japanese waters 10,000 kilometers away. Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from turtles at the Japanese nesting sites.

Which one of the following, if true, most seriously weakens the reasoning above?

(A) Nesting sites of loggerhead turtles have been found off the Pacific coast of North America several thousand kilometers north of the Baja peninsula.
(B) The distance between nesting sites and feeding sites of Atlantic loggerhead turtles is less than 5,000 kilometers.
(C) Loggerhead hatchlings in Japanese waters have been declining in number for the last decade while the number of nesting sites near the Baja peninsula has remained constant.
(D) Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from Atlantic loggerhead turtles.
(E) Commercial aquariums have been successfully breeding Atlantic loggerheads with Pacific loggerheads for the last five years.

Source : PowerScore
Source : LSAT PrepTest38 Q15
[Reveal] Spoiler: OA

Last edited by hazelnut on 21 Apr 2017, 23:41, edited 3 times in total.
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Re: Loggerhead turtles live and breed in distinct groups,of whic [#permalink]

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New post 10 May 2014, 00:38
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In first read, i got a little confused as how to go with the question, since the question stem itself is a little confusing.
But then i got more straight forward and blunt with the data answer choices were offering.

too many variables = in an exam secnarion , in time crunching situation too difficult to extract, if one can extract & then zone in nothing like that, if not POE ;

Skim through the stem : Feed in B / hatch in J ( DNA B = DNA J )

POE :

A : Nesting sites found in Pacific = Even if they are found in Egypt , what's in it for me = Eliminate

B: Nesting site = Feeding site Distance ( we are not here to solve a Time & Distance problem) = Eliminate

C : Hold = Speaks of Baja

D : Hold = Speaks of Baja

E : Aquariums = we are discussing 700-750 ( sea/Oceans ), where from this 300 score (Aquarium ) crops up = Eliminate

thus left with C n D :

C : Hatchlings decline in J ( may be Japan is stricter even with turtles wrt population control = Eliminate

D : Left with D = will mark n move & this is logical too ( In stem : B = J, Option D says B = A ; thus contradiction / Weaken )


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Re: Loggerhead turtles live and breed in distinct groups,of whic [#permalink]

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New post 10 May 2014, 01:53
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D creates that element of doubt that weaken the conclusion
some people might argue that D is contradicting the fact of the premise and that we are not allowed to do so but here is an answer to that :
fact is :Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from turtles at the Japanese nesting sites

conclusion is : juvenile Pacific loggerheads that feed near the Baja peninsula hatch in Japanese waters 10,000 kilometers away

now what D does is it that tells us that even though Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from turtles at the Japanese nesting sites still Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from Atlantic loggerhead turtles.---->there by creating a scope for a fact that all these turtles might be effectively same and hence we cannot say with full authority that it is Pacific loggerheads that feed near the Baja peninsula that hatch in Japanese waters 10,000 kilometers away .who knows they might be from altantic
note that in weakening or strengthening questions we cannot contradict the fact of the premise !!

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Re: Loggerhead turtles live and breed in distinct groups,of whic [#permalink]

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Premis: Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from turtles at the Japanese nesting sites.

Conclusion: juvenile Pacific loggerheads that feed near the Baja peninsula hatch in Japanese waters 10,000 kilometers away.

Assumption: 95% of the DNA Sample match indicates that the Baja turtles and Turtles at Japanese nesting sites are the same.

Which one of the following, if true, most seriously weakens the reasoning above?

(A) Nesting sites of loggerhead turtles have been found off the Pacific coast of North America several thousand kilometers north of the Baja peninsula.we don't care about this

(B) The distance between nesting sites and feeding sites of Atlantic loggerhead turtles is less than 5,000 kilometers.

(C) Loggerhead hatching in Japanese waters have been declining in number for the last decade while the number of nesting sites near the Baja peninsula has remained constant.
this choice is among contenders at first glance, but we should bear in mind that loggerhead hatching and number of nesting sites are unrelated.

(D) Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from Atlantic loggerhead turtles.

the fact that 95% of the DNA sample taken from B turtles match those of Atlantic turtles indicates that Atlantic turtles and Japanese ones have the same % of DNA match so it is absurd to conclude that they belongs to either places.

(E) Commercial aquariums have been successfully breeding Atlantic loggerheads with Pacific loggerheads for the last five years.

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Re: Loggerhead turtles live and breed in distinct groups,of whic [#permalink]

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New post 10 Jun 2015, 08:23
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Re: Loggerhead turtles live and breed in distinct groups,of whic [#permalink]

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New post 12 Jun 2015, 23:44
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Assumption: No problem with DNA analysis exists (quality, interpretation, interfering factors etc.)

D describes such problem

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Re: Loggerhead turtles live and breed in distinct groups,of whic [#permalink]

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mukulv wrote:
Loggerhead turtles live and breed in distinct groups,of which some are in the Pacific Ocean and some are in the Atlantic. New evidence suggests that juvenile Pacific loggerheads that feed near the Baja peninsula hatch in Japanese waters 10,000 kilometers away. 95% of the DNA samples taken from the Baja turtles match those taken from turtles at the Japanese nesting sites.

Which one of the following, if true, most seriously weakens the reasoning above?

(A) Nesting sites of loggerhead turtles have been found off the Pacific coast of North America several thousand kilometers north of the Baja peninsula.
(B) The distance between nesting sites and feeding sites of Atlantic loggerhead turtles is less than 5,000 kilometers.
(C) Loggerhead hatchlings in Japanese waters have been declining in number for the last decade while the number of nesting sites near the Baja peninsula has remained constant.
(D) 95% of the DNA samples taken from the Baja turtles match those taken from Atlantic loggerhead turtles.
(E) Commercial aquariums have been successfully breeding Atlantic loggerheads with Pacific loggerheads for the last five years.

Source : PowerScore
Source : LSAT PrepTest38 Q15


Quote:
It's a weaken question, so find the core, identify the gap, and then evaluate the answers looking for an answer that weakens the reasoning, the connection between the premise and conclusion.

So, the core of this argument is:

95% of Baja DNA match turtles in Japanese nest sites --> baby Pacific loggerheads hatch in Japan

Do you see a gap? Read like a debater. Do we have to conclude that the babies hatch in Japan if we find that 95% of the DNA matches? No. The data could not lead to that conclusion. As (D) suggests, perhaps other turtles, ones that definitely do not hatch in Japan, have the same 95% DNA. That would mean that having a 95% match-up is not meaningful.

(A) is tempting - they found other nests in the pacific. However, perhaps those nests are for different loggerhead turtles.

(B) is unimportant - maybe the Atlantic turtles are wimps while the Pacific ones eat their Wheaties.

(C) is comparing nest numbers in Japan to those near the Baja peninsula. But who cares how many nests there are? Maybe the number of Baja Peninsula turtles is declining! That would
match them up with the Japanese phenomenon. And how many nests are there in the Baja peninsula - maybe the number is constantly at 2!

(E) aquariums?! You'd have to do a ton of work to make this answer relevant - the turtles would have to plan and execute a daring escape and then disperse to the various turtle clubs that are discussed in this problem.


KAPLAN EXPLANATION


(D) Weaken the Argument

Establishing an equally plausible, alternative hypothesis to the one advanced by the argument is a great way to weaken that argument. The “new evidence” that the Baja turtles hatch in Japanese waters is the DNA match of 95% of them with Japanese turtles. But if the Baja turtles match up equally well with Atlantic turtles, as (D) asserts, then it’s a 50/50 shot as to whether the Baja turtles hatch in Japan or the Atlantic—the evidence is equivalent either way.

(A), (B), (C), and (E) can all be quickly eliminated for one simple reason: None of them deals with the DNA match-up evidence, the one and only support provided for the initial claim that the Baja turtles hatch in Japan.
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Re: Loggerhead turtles live and breed in distinct groups,of whic [#permalink]

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New post 07 May 2017, 04:40
Just because there DNA matches 95 % it doesnt mean Juvenile turtle will travel 10000 km to hatch .
(A) Nesting sites of loggerhead turtles have been found off the Pacific coast of North America several thousand kilometers north of the Baja peninsula. doesn't attack argument
(B) The distance between nesting sites and feeding sites of Atlantic loggerhead turtles is less than 5,000 kilometers. baja turtle??
(C) Loggerhead hatchings in Japanese waters have been declining in number for the last decade while the number of nesting sites near the Baja peninsula has remained constant. no effect on argument
(D) Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from Atlantic loggerhead turtles. it shows that their DNA match 95% with Atlantic turtle also
(E) Commercial aquariums have been successfully breeding Atlantic loggerheads with Pacific loggerheads for the last five years. breeding has no effect on argument

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Re: Loggerhead turtles live and breed in distinct groups,of whic [#permalink]

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New post 14 Nov 2017, 02:35
LSAT questions do not seem to fit the gmat prep.

The logic behind LSAT questions can be applied to gmat questions. Nevertheless, things, such as patterns, option choices, the content of the argument, the structure of the passage, are all different.

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Re: Loggerhead turtles live and breed in distinct groups,of whic   [#permalink] 14 Nov 2017, 02:35
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Loggerhead turtles live and breed in distinct groups,of whic

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