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Black Americans are, on the whole, about twice as likely as

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Re: Black Americans are, on the whole, about twice as likely as [#permalink]

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New post 03 Jan 2018, 17:37
Can anyone please help me clarify this one? I still don't understand why A makes sense :(
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Re: Black Americans are, on the whole, about twice as likely as [#permalink]

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New post 13 Jan 2018, 13:44
lichting wrote:
Can anyone please help me clarify this one? I still don't understand why A makes sense :(


Let me give it a shot.

Premise: 2 studies=> westernized and of black descendant seems to be correlated with high BP
Conclusion: Researchers => The relationship between high-salt diet and salt-UNFRIENDLY genes may be the cause.
Breaking down the Conclusion: Presumably (most) blacks are descendants of a population that doesn't interact with salt much, thus, these blacks possesses genes that cannot process copious amounts of salt in westernized diets, causing high blood pressure.

Stem: Strengthen: find proof of the researcher's claim.

Trick: Which of the following statements about *present-day, westernized black Africans*...From this we know that all the statements are about characteristics of WESTERNIZED black Africans NOW. By definition, if they have genes that can't process salt..and they eat KFC all day long (westernized), they'll have high blood pressure!!. This is what we are looking for.

d) Blood pressures are low among the Yorubam who throughout their history, have been situated far inland from sources of sea salt and far south of Saharan salt mines This contradicts the researcher's statement. If they were away from salt (which means they have the bad genes), then after 5 Big Macs they should have high blood pressure NOT low!

a) The blood pressures of those descended from peoples situated throughout their history in Senegal and Gambia, where salt was always available, are low. This statement says: black Africans with genes that CAN PROCESS salt EFFECTIVELY have low blood pressure. Hmm sounds very odd, I know. Although this isn't directly what we are looking for, this eliminates an alternative cause. Think about what happens if black Africans with genes that CAN PROCESS salt EFFECTIVELY have HIGH blood pressure. That statement pretty much destroys the researcher's claim and says instead there must be another cause for the high blood pressure - perhaps the salt itself, the aggravation that comes with becoming westernized, or that dreaded KFC gravy...

By eliminating a claim that destroys the author's claim, A effectively strengthens the argument.

I hope this helped. :D
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Re: Black Americans are, on the whole, about twice as likely as   [#permalink] 13 Jan 2018, 13:44

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