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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 12 Apr 2005, 10:30
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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.
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i hate when people do'nt post the OA, it leaves in guessing!!!!

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 [#permalink] New post 12 Apr 2005, 10:45
A - Even when they have sufficient salt available their blood pressure is low thus proving that it is the western high-salt diets which cause high blood pressure in these people.
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 [#permalink] New post 12 Apr 2005, 11:20
Should be D.
The stem is looking for conditions which have genetically adapted the black africans for low salt conditions.
A doesn't tell us that they are genetically adapted to an environment of low salt - in fact it tells us that DESPITE the availability of salt they have lo bp.
D on the other hand supplies an instance of how environmental factors contributed to the gene-adaptation.
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 [#permalink] New post 12 Apr 2005, 11:26
greycellz wrote:
Should be D.
The stem is looking for conditions which have genetically adapted the black africans for low salt conditions.
A doesn't tell us that they are genetically adapted to an environment of low salt - in fact it tells us that DESPITE the availability of salt they have lo bp.
D on the other hand supplies an instance of how environmental factors contributed to the gene-adaptation.


greycellz, Can you explain what you mean by gene-adaptation - becos they still have low blood pressure.
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 [#permalink] New post 12 Apr 2005, 11:52
This is in the stem:
Quote:
may reflect an interaction between western high-salt diets and genes that adapted to an environmental scarcity of salt

And we need to find a choice that'd most confirm the hypothesis. The only choice related to the gene adaptation of Africans is D - wherein the Africans have adapted to the low availability of salt. If they develop high blood pressure then it is possibly explained by the fact that their genes are adapted for low salt - but when these genes interact with high salt diets, they cause high bp..
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 [#permalink] New post 12 Apr 2005, 15:38
On thinking again, it looks like A.
A provides an instance of westernized africans who have low bp since their ancestors had salt available to them and hence their genes have adapted to higher salt content.
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 [#permalink] New post 12 Apr 2005, 18:20
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 [#permalink] New post 12 Apr 2005, 19:55
"A" shud be it.....W.black ppl who have high BP tend to have genes that r adapted for low salt env......so if we have a w.black ppl who has genes that r adapted to high salts then even high salt Western foods will not affect him/her...keeping the BP low.

if X (i.e. low salt genes) ----> Y (i.e. high BP due to salty food)

that follows........no Y (i.e.low BP) ------> no X (i.e. high salt genes).....that's what A is saying.
  [#permalink] 12 Apr 2005, 19:55
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