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

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

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New post 04 Feb 2005, 09:28
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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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Director
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 [#permalink]

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New post 04 Feb 2005, 09:53
I would go with ‘D’
A – Weakens the hypotheseis
B – Out of context
C – Out of context
E – Neither weakens nor strengthens the hypothesis

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Re: cr- black americans [#permalink]

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New post 04 Feb 2005, 10:45
Hypothesis: interaction bt high salt diet and genes that fits for low salt leads to 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.
no genes for low salt -> no HBP.
Seems support the hypothesis

(B) The unusually high salt consumption in certain areas of Africa represents a serious health problem.
high salt consumption leads to health problem
It's a claim that has no relavence

(C) Because of their blood pressure levels, most White Africans have markedly decreased their salt consumption.
What people do because of their belief will not confirm whether the belief is right

(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.
genes for less salt -> low HBP
Won't support the hypothesis

(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.
genes don't matter
weakens the hypothesis

(A)

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 [#permalink]

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New post 04 Feb 2005, 16:18
OA is A

Good explanation Hong Hu

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  [#permalink] 04 Feb 2005, 16:18
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