selective advantage for certain blood groups

Human Anatomy, Physiology, and Medicine. Anything human!

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TYLS
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selective advantage for certain blood groups

Post by TYLS » Thu Oct 10, 2013 1:16 pm

the human physiology is fascinating and at times leaves us bewildered at the splendor of its intricacy. i am puzzled as to why we have so many different blood types / groups etc.

how were blood groups evolved? i don't understand how certain blood types prevail over the others. (i.e. quoting guyton's textbook of medical physio, type O- 47%, A- 41%, B-9%, AB-3%).

a quick search online revealed minor selective factors like the Duffy antigen receptor being recognised by the malarial parasites etc. but why does the major blood type (ABO) have the large variation in frequency as quoted from guyton?

i'm not too sure if there was any practice of mixing blood in the past etc. would appreciate it if you could share your thoughts.

thanks a million

TYLS
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Post by TYLS » Thu Oct 10, 2013 2:55 pm

same applies to Rh blood types (~100% Rh + in african blacks, 85% Rh+ in whites)

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