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High blood pressure in Black people

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High blood pressure in Black people [#permalink] New post 07 Sep 2007, 15:57
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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Re: High blood pressure in Black people [#permalink] New post 07 Sep 2007, 18:16
Ravshonbek 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.


D.
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Re: High blood pressure in Black people [#permalink] New post 07 Sep 2007, 18:31
Ravshonbek 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.


Why can`t it be A?
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 [#permalink] New post 07 Sep 2007, 18:33
On second thought, It's probably A.

Last edited by JingChan on 07 Sep 2007, 18:52, edited 2 times in total.
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Re: High blood pressure in Black people [#permalink] New post 07 Sep 2007, 18:36
IrinaOK wrote:
Ravshonbek 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.


Why can`t it be A?


I think it can be...I am not sure about my answer.
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 [#permalink] New post 08 Sep 2007, 12:58
i believe that A actually negates the researcher's hypothesis.

If the bp of these people are low inspite of the available salt then the conclusion of the researcher is wrong.

D strengthens the conclusion.
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 [#permalink] New post 08 Sep 2007, 15:49
I believe it's A.

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.

This means they had genes that componset for low availibility salt, so when they have high-salt diet they have high BP.

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 indicate that the descended from peoples situated throughout their history in Senegal and Gambia don't have same gene as salt was always available, so even if they have high salt diet they are able to maintain low BP.

Therefore it supports Researchers hypothesis
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 [#permalink] New post 11 Oct 2007, 05:34
whats the OA?
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 [#permalink] New post 11 Oct 2007, 06:13
This is a tough one ...for me atleast :(
I am just not getting it ....
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 [#permalink] New post 11 Oct 2007, 06:22
Will Go for A.

Researcher's hypothesis says that western high salt diets w/ genetic predisposition to scarcity of salts leads to high BP in westernized Blacks.

A confirms that ppl with living in regions of salt scarcity have low BP - which confirms that when they get on western high salt diets give them high BP.

D on the other hand says Yoruba live in regions far from salt mines etc. Living far from salt sources may not mean salt scarcity. Yoruba could import salt.

Just my 2 cents. What's OA?
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Re: High blood pressure in Black people [#permalink] New post 11 Oct 2007, 06:30
It is A. D does not reject the hypothesis, however, it does not support it.

See the question, it asks about the westernized people.

What is the implication?
African people had scarce resources of salt ---> now they had plethora of it ---> genes just can't fight it.

A says: Some Africans had plenty of salt ---> now they had abundance, too ---> their genes can fight it.

The general theory "no salt in past -> high BP" MUST have the other side "salt in past -> normal BP" This is supported by A.
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 [#permalink] New post 11 Oct 2007, 17:42
excelgmat wrote:
i believe that A actually negates the researcher's hypothesis.

If the bp of these people are low inspite of the available salt then the conclusion of the researcher is wrong.

D strengthens the conclusion.



I agree.
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 [#permalink] New post 11 Oct 2007, 17:49
Da da D!
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Re: High blood pressure in Black people [#permalink] New post 11 Oct 2007, 21:23
Ravshonbek 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.


I have looked at this question several times now and have concluded that the answer should be A based on logical reasoning.

This answer depends on the logic concept that:
A implies B
is equivalent to
Not B implies Not A

So the conclusion is
Scarce salt -> High BP

A says:
Not (Scarce Salt) & Not (High BP), which is consistent with our conclusion

D says:
Scarce Salt & Not (High BP), which would mean that scarce salt does NOT imply high BP, which is not consistent with the conclusion.
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 [#permalink] New post 11 Oct 2007, 21:51
its D,
A actually negates the author hyphothesis
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Re: High blood pressure in Black people [#permalink] New post 11 Oct 2007, 22:07
Why does D does not conflict with our conclusion?

Which of the following statements about present-day, westernized Black Africans...:
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 saying:
Present day black Africans [from Yoruba but now in America] who have historically not had salt, have low BP.

Conclusion:
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.

[Rephrased]
Present day black Africans who have historically not had salt, have high BP.
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 [#permalink] New post 11 Oct 2007, 22:14
Its time for an OA.
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 [#permalink] New post 11 Oct 2007, 22:34
GMATBLACKBELT wrote:
Its time for an OA.


I was impatient and google'd the passage:

http://www.urch.com/forums/gmat-critica ... ikely.html

They have similar discussions, but ultimately say the answer is A.
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Re: High blood pressure in Black people [#permalink] New post 15 Oct 2007, 13:17
Would go for A.
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 [#permalink] New post 18 Oct 2007, 19:22
Folks,

When you explain answer with the reason try to use simpler language, please. Don't use the cryptic langauge as in CR itself.
  [#permalink] 18 Oct 2007, 19:22
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