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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] New post 07 Nov 2006, 01:56
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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.


PS select this space for OA & my doubt:
OA is A. My query is not why A is correct but why is D incorrect… :twisted:
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Re: CR: Challenge5: Salty Blood Pressures [#permalink] New post 07 Nov 2006, 02:35
themaddy2002 wrote:
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.


PS select this space for OA & my doubt:
OA is A. My query is not why A is correct but why is D incorrect… :twisted:


We need an answer that says that genes get adapted depending on salt availability.

A is my answer.

D does nt indicate anything about adaptation. It says that blood pressures are low among the Yoruba.

If D says something about, what happened when Yoruba people started taking salt rich diet, and whether blood pressure increased with higher salt in the diet, then it can be an answer.
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Last edited by ak_idc on 07 Nov 2006, 04:08, edited 1 time in total.
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 [#permalink] New post 07 Nov 2006, 03:43
I'm with A
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 [#permalink] New post 07 Nov 2006, 07:03
A....as explained above
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 [#permalink] New post 07 Nov 2006, 11:06
To me D is the only one makes sense.
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 [#permalink] New post 07 Nov 2006, 11:44
Clear A.
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 [#permalink] New post 07 Nov 2006, 11:58
A 2
  [#permalink] 07 Nov 2006, 11:58
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