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

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

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New post 23 Oct 2009, 08:04
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A
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Black Americans are, on the whole, about twice as likely as White Americans to develop high blood pressure. This likelihood also holds for westernized Black Africans when compared to White Africans.
Researchers have hypothesized that this predisposition in westernized Blacks may reflect an interaction between western high-salt diets and genes that adapted to an environmental scarcity of salt.

Which of the following statements about present-day, westernized Black Africans, if true, would most tend to confirm the researchers' hypothesis?

(A) The blood pressures of those descended from peoples situated throughout their history in Senegal and Gambia, where salt was always available, are low.

(B) The unusually high salt consumption in certain areas of Africa represents a serious health problem.

(C) Because of their blood pressure levels, most White Africans have markedly decreased their salt consumption.

(D) Blood pressures are low among the Yoruba, who, throughout their history, have been situated far inland from sources of sea salt and far south of Saharan salt mines

(E) No significant differences in salt metabolism have been found between those people who have had salt available throughout their history and those who have not.

[Reveal] Spoiler:
OA to come...want ur perspective (http://forum.prachipareekh.net/viewtopic.php?f=24&t=556)

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New post 23 Oct 2009, 10:33
I picked D. Because I think it states that genes of africans got used to salt scarcity that in turn strengthens the argument. Any other reasoning?

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BINGO! Understood!
We do not even need to look at the whole stimulus! what we need to show is the interaction between salt diets and genes. All the choices except A do not provide this relationship. Thus, clear A.
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Last edited by barakhaiev on 24 Oct 2009, 12:09, edited 1 time in total.

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New post 23 Oct 2009, 13:04
tough question for me, i thought C first, followed the link for OA and explanationo
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New post 26 Oct 2009, 20:02
barakhaiev wrote:
I picked D. Because I think it states that genes of africans got used to salt scarcity that in turn strengthens the argument. Any other reasoning?

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BINGO! Understood!
We do not even need to look at the whole stimulus! what we need to show is the interaction between salt diets and genes. All the choices except A do not provide this relationship. Thus, clear A.


The only problem that i found with A is we need to assume that Senegal and Gambia are part of Africa otherwise i agree with A
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New post 28 Oct 2009, 08:04
I choose A.

I think it is OK to assume gambia and senegal are african countries here. The question ask about modern day westernized africans and so A should be talking about those westernized africans who descended from Gambia or senegal.

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New post 13 Nov 2009, 21:27
A looks correct, as it supports the researchers' hypothesis.
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Re: High blood pressure [#permalink]

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New post 18 Jun 2010, 03:36
I go for A because:

The hypothesis is that the high blood pressure likelihood of westernized Blacks compares to that of Whites may reflect an interaction between western high-salt diets and genes that adapted to an environmental scarcity of salt.

A) Blood pressure is low among people whose genes adapt to areas available salt. --> yes, it may support for the hypothesis

B) "serious health problem" doesn't mean this problem relates to blood pressure --> eliminated

C) White Africans have markedly decreased their salt consumption --> this supports for "this likelihood also holds for westernized Black Africans when compared to White Africans" rather than for the hypothesis --> eliminated

D) Blood pressure is low among people far from salt source --> weakens the hypothesis --> eliminated

E) Salt metabolism quite little values to high-salt diets or genes --> eliminated

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Re: High blood pressure [#permalink]

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New post 22 Jun 2010, 09:37
Answer is A.

The hypothesis made by the author is that - people in area with scarcity of salt tend to have high blood pressure.

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 answer is correct. Since it tells that area of Senegal and Gambia has salt available, hence low blood pressure amongst the people.

(B) The unusually high salt consumption in certain areas of Africa represents a serious health problem.
-- Neutral .Does not matter.

(C) Because of their blood pressure levels, most White Africans have markedly decreased their salt consumption.
-- Neutral .Does not matter.

(D) Blood pressures are low among the Yoruba, who, throughout their history, have been situated far inland from sources of sea salt and far south of Saharan salt mines
-- This is opposite answer. It is opposite of the hypothesis made by the author.

(E) No significant differences in salt metabolism have been found between those people who have had salt available throughout their history and those who have not.
-- Neutral .Does not matter.

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Re: High blood pressure   [#permalink] 22 Jun 2010, 09:37
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