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swanidhi
Understood all aspects except the usage of If here. Why couldn't this statement be a conditional case?
Is it because of the contrast that follows (even though) with the verb 'are'?
Please explain. Thanks!

Hi,
two reasons..
the structure of the sentence is..
although..SOME FACT..., some genetic...

1)so it will be wrong to make a fact as a conditional clause..
2) there is no contrast and that is the reason A is not the choice,...
basically the first part is the reason or modifier of the second part, so "if" is unsuitable..
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In general, "Because" modifies or presents reasons ("why") for actions; in this specific case, the correct answer choice is (D) since, the fact that some genetic lines may eventually die out entirely is explained by the fact that genetic recombination ensures that only half the genetic material of a parent is represented in the offspring.
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The other day i was studying about the difference between although, even though, but and because, this site ' https://www.grammar-quizzes.com/9-1.html ' Clearly mentions the same. Although I was able to understand the difference and same thing I applied over here. Where did I go wrong, Kindly help..
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This looks like a meaning problem.
Can honestly be interpreted two ways:

BECAUSE only half the genes get passed, some lineages die out.
ALTHOUGH half of the genes are guaranteed to be passed by each parent, some lineages still die out.

I can see it both way. I suppose you could make a stronger argument for "because". Tricky question.
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This is a good question but if you look at it carefully '(D)Because ' CANNOT be the right answer., the first half says that 'genetic recombination ensures that only half the genetic material is transferred from parent to offspring', which means that mathematically the amount of genetic material transferred can never be zero, it will be half of the parent but which CANNOT be zero.

Therefore, the cause and effect logic cannot apply to this question. Instead, the first part of the question is in contrast to the next part and hence, the correct answer should be '(A)Although '

@bunnel chetan2u Please tell me if, and how, my interpretation is wrong.
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fireagablast
This looks like a meaning problem.
Can honestly be interpreted two ways:

BECAUSE only half the genes get passed, some lineages die out.
ALTHOUGH half of the genes are guaranteed to be passed by each parent, some lineages still die out.

I can see it both way. I suppose you could make a stronger argument for "because". Tricky question.

it is also confusing to me a little bit between (A) and (D), Bunuel could you please explain a bit more?
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Meaning problem here.
Poor Quality

Agreed kushalkh93

Because is used for something to hold true. There is no cause and effect here. There is a contrast in absolute terms.
Although is absolutely fine as stated by kushalkh93

Please reply Bunuel chetan2u
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So on the debate between "Although" and "Because". The phrase "only half" signifies that half is less. If "only" was not present, I can see how "Although" might work.
Now regarding meaning, as some stated "half ensures the genetic line doesn't die out", it would if you continuously halve it.
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Although is the correct answer. The sentence is grammatical incorrect if using because due to the nonrestrictive clause.
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