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Q1:A
In addition, they report that one of eight study turtles from Aves Island, off Venezuela, showed the same genetic pattern as the Tortuguero

Above gives the answer of the question.

Q2:B Present a new idea along with some data

Para 2 tells about Natal homing theory and says the "animals part company at breeding time, each swimming hundreds or thousands of miles to breed and nest at its own birthplace. "
Para 3 Accepts the things said in para 2 but with some caveats.Those caveats include some data.
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tejyr

For last question I was confused between A and B. Can any one explain.

tejyr Please read the following excerpt.

Quote:
This finding indicates that either some social mixing occurred between these two groups or that the DNA test was not sensitive enough to detect extremely subtle differences in DNA.

This finding indicates either "social mixing occurred" or "some other event" So, there are two possibilities. Option A cannot be answered as we don't have a concrete info on the occurrence of social mixing. The passage states that either social mixing happened or some other event happened. Hence option A is incorrect.

option B can be answered by the passage using the following lines.

1. Brian W. Bowen, an evolutionary geneticist, turned to four green turtle breeding sites in the Atlantic and the Caribbean.
2. The existence of variations in DNA among geographically distinct groups has helped scientists evaluate the different theories of the mating habits
3. reptiles born in different regions may share common feeding grounds away from home
4. they report that one of eight study turtles from Aves Island, off Venezuela, showed the same genetic pattern as the Tortuguero and Hutchinson turtles
5. Bowen’s study appears to have bolstered the idea that most populations of green turtles are genetically distinct
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Took 6:26 min in total including 3 min to read the passage!

Passage Map:


1) Alternate Method
2) Analysis supports "natal homing” theory
3) Caveats of new alternate method; Conclusion
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tejyr

For last question I was confused between A and B. Can any one explain.

tejyr Please read the following excerpt.

Quote:
This finding indicates that either some social mixing occurred between these two groups or that the DNA test was not sensitive enough to detect extremely subtle differences in DNA.

This finding indicates either "social mixing occurred" or "some other event" So, there are two possibilities. Option A cannot be answered as we don't have a concrete info on the occurrence of social mixing. The passage states that either social mixing happened or some other event happened. Hence option A is incorrect.

option B can be answered by the passage using the following lines.

1. Brian W. Bowen, an evolutionary geneticist, turned to four green turtle breeding sites in the Atlantic and the Caribbean.
2. The existence of variations in DNA among geographically distinct groups has helped scientists evaluate the different theories of the mating habits
3. reptiles born in different regions may share common feeding grounds away from home
4. they report that one of eight study turtles from Aves Island, off Venezuela, showed the same genetic pattern as the Tortuguero and Hutchinson turtles
5. Bowen’s study appears to have bolstered the idea that most populations of green turtles are genetically distinct


Can you or anyone please give an explanation of question 7. I was confused between B and C. Then I went for B. Thanks!
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Adambhau
Nikhil
tejyr

For last question I was confused between A and B. Can any one explain.

tejyr Please read the following excerpt.

Quote:
This finding indicates that either some social mixing occurred between these two groups or that the DNA test was not sensitive enough to detect extremely subtle differences in DNA.

This finding indicates either "social mixing occurred" or "some other event" So, there are two possibilities. Option A cannot be answered as we don't have a concrete info on the occurrence of social mixing. The passage states that either social mixing happened or some other event happened. Hence option A is incorrect.

option B can be answered by the passage using the following lines.

1. Brian W. Bowen, an evolutionary geneticist, turned to four green turtle breeding sites in the Atlantic and the Caribbean.
2. The existence of variations in DNA among geographically distinct groups has helped scientists evaluate the different theories of the mating habits
3. reptiles born in different regions may share common feeding grounds away from home
4. they report that one of eight study turtles from Aves Island, off Venezuela, showed the same genetic pattern as the Tortuguero and Hutchinson turtles
5. Bowen’s study appears to have bolstered the idea that most populations of green turtles are genetically distinct


Can you or anyone please give an explanation of question 7. I was confused between B and C. Then I went for B. Thanks!



Hi Adambhau,

7. According to the passage, which of the following supports the contention that green turtles rarely interbreed?

For this Question we are looking for an option that supports that argument that green turtles rarely interbreed. Let's look at the options B and C.

Quote:
B. One of eight turtles studied from Aves Island, Venezuela shared a genetic pattern characteristic of turtles from a different breeding ground.
This is the second part of Bowen's theory, that bolstered the idea that most populations of green turtles are genetically distinct, and that turtles return to their birthplaces at nesting time.

Now this option is correct statement wise, as its present in the passage, but is it relevant to the Question asked? No, we need an answer that supports the above contention.

Quote:
C. When analyzing the DNA of turtles, scientists found differences in the genetic makeup of turtles from various areas.

Correct, as this option is a paraphrase of the information present in the second para, which discusses one side of Bowen's research that scientists found differences in the genetic makeup of turtles from various areas.

Thus answer is C is the correct answer.


Hope This Helps.
Thanks.
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Hi Adambhau,

7. According to the passage, which of the following supports the contention that green turtles rarely interbreed?

For this Question we are looking for an option that supports that argument that green turtles rarely interbreed. Let's look at the options B and C.

Quote:
B. One of eight turtles studied from Aves Island, Venezuela shared a genetic pattern characteristic of turtles from a different breeding ground.
This is the second part of Bowen's theory, that bolstered the idea that most populations of green turtles are genetically distinct, and that turtles return to their birthplaces at nesting time.

Now this option is correct statement wise, as its present in the passage, but is it relevant to the Question asked? No, we need an answer that supports the above contention.

Quote:
C. When analyzing the DNA of turtles, scientists found differences in the genetic makeup of turtles from various areas.

Correct, as this option is a paraphrase of the information present in the second para, which discusses one side of Bowen's research that scientists found differences in the genetic makeup of turtles from various areas.

Thus answer is C is the correct answer.


Hope This Helps.
Thanks.[/quote]


bm2201 Thanks for the explanation. But the question emphasizes "rarely" interbreed. It seems like C mentions that interbreed is a normal phenomenon, not a rare phenomenon. And From B, "One of eight" represents a rare phenomenon, and "shared a genetic pattern" represents interbreed if I understand sentences correctly.
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Adambhau
Hi Adambhau,

7. According to the passage, which of the following supports the contention that green turtles rarely interbreed?

For this Question we are looking for an option that supports that argument that green turtles rarely interbreed. Let's look at the options B and C.

Quote:
B. One of eight turtles studied from Aves Island, Venezuela shared a genetic pattern characteristic of turtles from a different breeding ground.
This is the second part of Bowen's theory, that bolstered the idea that most populations of green turtles are genetically distinct, and that turtles return to their birthplaces at nesting time.

Now this option is correct statement wise, as its present in the passage, but is it relevant to the Question asked? No, we need an answer that supports the above contention.

Quote:
C. When analyzing the DNA of turtles, scientists found differences in the genetic makeup of turtles from various areas.

Correct, as this option is a paraphrase of the information present in the second para, which discusses one side of Bowen's research that scientists found differences in the genetic makeup of turtles from various areas.

Thus answer is C is the correct answer.


Hope This Helps.
Thanks.


bm2201 Thanks for the explanation. But the question emphasizes "rarely" interbreed. It seems like C mentions that interbreed is a normal phenomenon, not a rare phenomenon. And From B, "One of eight" represents a rare phenomenon, and "shared a genetic pattern" represents interbreed if I understand sentences correctly.[/quote]


Hi Adambhau,

Quote:
C. When analyzing the DNA of turtles, scientists found differences in the genetic makeup of turtles from various areas.

Option C doesn't imply that the interbreed is a normal phenomenon, it actually implies that since there were distinct differences in the genetic makeup of turtles from various areas that led scientists to theorize that that green turtles rarely interbreed.


Can also be inferred from the 2nd para: The existence of variations in DNA among geographically distinct groups has helped scientists evaluate the different theories of the mating habits of the green turtle. Their findings, Bowen asserts, lend credence to the “natal homing” theory. This theory holds that while reptiles born in different regions may share common feeding grounds away from home, the animals part company at breeding time, each swimming hundreds or thousands of miles to breed and nest at its own birthplace.



Hope This Helps.
Thanks.
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Can anyone please explain to me Why D is in 6th?. Though I marked the correct option by applying elimination.
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