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Until recently, scientists did not know of a close vertebrate analogue

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Re: Until recently, scientists did not know of a close vertebrate analogue  [#permalink]

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New post 10 Jul 2018, 10:27
srishti201996 wrote:
9 minutes!
one incorrect!

Can someone help please?

question no 6!
Why is the choice C in Q6 wrong?

Cooperative breeding has evolved many times in vertebrates, but unlike naked mole rats, most cooperatively breeding vertebrates (except the wild dog, Lycaon pictus) are dominated by a pair of breeders rather than by a single breeding female.
In naked mole rat societies, on the other hand, differences in behavior are related primarily to reproductive status (reproduction being limited to the queen and a few males

Doesn't the sentence mentioned above reflect the fact stated in option C?
(C) Among naked mole rats, many males are permitted to breed with a single dominant female.

Quote:
6. According to the passage, naked mole rat colonies may differ from all other known vertebrate groups in which of the following ways?

(A) Naked mole rats exhibit an extreme form of altruism.

(B) Naked mole rats are cooperative breeders.

(C) Among naked mole rats, many males are permitted to breed with a single dominant female.

(D) Among naked mole rats, different tasks are performed at different times in an individual's life.

(E) Among naked mole rats, fighting results in the selection of a breeding female.

The answer lies in the 2nd BF portion: "reproduction being limited to the queen and a few males."

Among naked mole rats, only a few males (not many) breed with a single dominant female. Thus, (C) does not accurately describe the naked mole rats.

Furthermore, we are told that "most (not all)cooperatively breeding vertebrates are dominated by a pair of breeders rather than by a single breeding female. This suggests that some other cooperatively breeding vertebrates have a single breeding female. Thus, this feature would NOT be unique to naked mole rats.

(C) can be eliminated.

I hope that helps!
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Re: Until recently, scientists did not know of a close vertebrate analogue  [#permalink]

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New post 26 Sep 2018, 00:58
Hi ,
In Q6
We have given that "such a vertebrate society(which exhibits altruism) may exist among underground colonies of the highly social rodent Heterocephalus glaber, the naked mole rat. "
So as in A , i feel like its too extreme that they always exhibits.
Please correct me if i m wrong
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Re: Until recently, scientists did not know of a close vertebrate analogue &nbs [#permalink] 26 Sep 2018, 00:58

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