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What is the most common blood type

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O positive is the most common blood type and used to be considered to be the universal blood type. [ Source: http://www.chacha.com/question/what-is-the-most-common-blood-type ]
More Answers to "What is the most common blood type"
The most common blood type is O+
type O pos is most common and AB neg the rarest. There are lots of other groups such as kell and e but these can normally be ignored for giving or receiving blood. If you are type O neg you can give blood to anyone and if you are AB pos you...
O+ (positive) is the most common Blood type (39% of the population).

Related Questions Answered on Y!Answers

What is the most common and most rare blood type?
Q: i was wondering what is the most common blood type and what was the most rarest.
A: The rarest blood type is AB negative; the most common is O+, I believe.It depends on what part of the world you mean. I'm assuming that you're talking about the world in general, but there are specific differences in certain parts of the world.
Is oh positive the most common blood type in almost every country in the world??
Q: if not, then in which countries or continents is it most common in?? im curious lol, i have O+ type blood. and i know that at least here in America, oh positive is the most common type! im a blood donor. ive also heard its the most common type in almost every country....is this true??
A: ABO and Rh distribution by nation:http://en.wikipedia.org/wiki/Blood_types#ABO_and_Rh_distribution_by_nation
Why is O+ the most common blood type in the world?
Q: This is bugging the hell out of me. Is it because Mendel's Laws has it prevailing as the highest when done randomly? But then that wouldn't explain why some countries have A as the prevailing blood type. I understand that O+ IS the most common blood type just not why it is.... can someone help?
A: the person above me is wrong, the allele for O blood type is actually NOT dominant. A and B are dominant over O. anyways, according to this site i guess A blood type developed first and then O and B last. (through evolution). http://www.bio-medicine.org/biology-definition/Blood_type/Since O is more universal, maybe over the years full blood transfusions replaced a few A types with O so the number beat them. no clue on that though, just a guess.google it for a while and see what you find.

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