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prachi
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Post subject: CR - Black Americans  Posted: Sun Mar 08, 2009 9:50 pm |
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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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nitya34
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Post subject: Re: CR - Black Americans Posted: Sun Mar 08, 2009 10:05 pm |
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bmlaud
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Post subject: Re: CR - Black Americans Posted: Sun Mar 08, 2009 10:42 pm |
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IMO B
Genes in Africans maintain the blood pressure for low salt consumptions---> High salt consumption by Africans will cause a health problem.
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"Great works are performed not by strength but by perseverance."
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nitya34
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Post subject: Re: CR - Black Americans Posted: Sun Mar 08, 2009 11:07 pm |
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I eliminated it as I tht its not mentionting abt "High Pressure".. "health problem" is too general IMO bmlaud wrote: IMO B
Genes in Africans maintain the blood pressure for low salt consumptions---> High salt consumption by Africans will cause a health problem. _________________ http://nitya34.blogspot.com/_________________________
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prachi
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Post subject: Re: CR - Black Americans Posted: Mon Mar 09, 2009 11:56 am |
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B - incorrect - The unusually high salt consumption in certain areas of Africa represents a serious health problem.
D - incorrect - 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
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bmlaud
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Post subject: Re: CR - Black Americans Posted: Mon Mar 09, 2009 3:10 pm |
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 getting new learning opportunities! I go with E now. Option E serves as an assumption that is required to compare Africans and westerners.
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"Great works are performed not by strength but by perseverance."
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prachi
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Post subject: Re: CR - Black Americans Posted: Tue Mar 10, 2009 8:50 am |
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E - incorrect - No significant differences in salt metabolism have been found ... - irrelevant ... weakens
Apply logical reasoning
IF A THEN B => IF NOT B THEN NOT A
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bmlaud
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Post subject: Re: CR - Black Americans Posted: Tue Mar 10, 2009 7:39 pm |
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I have some doubts on this question. My understanding is
Adapted genes---> Black ( irrespective of American or African)
Normal genes ----> White
Cause: Adapted genes; Effect: High BP
To support: If cause is absent, effect is also absent
=> White people should not have a problem of High BP ( For high salt diets)
Option C says the opposite ???
If I consider Africans have adapted genes and Americans have normal genes(irrespective of their skin colours) then Option C would be correct but then the premise that "Black Americans are about twice as likely as White Americans to develop high blood pressure. " would go wrong???
Can you please help me out?
Thanks
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"Great works are performed not by strength but by perseverance."
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prachi
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Post subject: Re: CR - Black Americans Posted: Tue Mar 10, 2009 9:08 pm |
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Yep C is not the answer  OA: A -- this is a tough CR  Stem says Westernized Black Americans have genes that adapted to an environmental scarcity of salt => high salt diets => high blood pressure A says - The blood pressures of those descended from peoples situated throughout their history in Senegal and Gambia, where salt was always available, are low => genes did not adapted to an environmental scarcity of salt as they lived where the salt was always available...thus low Blood pressure..this acts like an evidence Says: have genes that adapted to an environment where salt was always available => high salt diets => Blood pressure is low... Bit of clue from here too  Ques says Which of the following statements about present-day, westernized Black Africans, if true, would most tend to confirm the researchers' hypothesis? A says those descended from peoples
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apoorva
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Post subject: Re: CR - Black Americans Posted: Fri Mar 05, 2010 3:05 pm |
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