mutale Posted November 7, 2012 Share Posted November 7, 2012 Why is 3 quarters of the worlds population genetically coded Opositives (inas blood group wise)?? Link to comment Share on other sites More sharing options...
Jens Posted November 17, 2012 Share Posted November 17, 2012 (edited) I am not sure what your question was: In case you wanted the term to be explained: Actually in most other languages the system is called AB0 (a zero) and not ABO (an O). Humans have either the A antigen, the B antigen or no antigen (this is why it is called zero in most other languages). So the term "O-positive" is a bit strange (means you positively have nothing ). In case you wanted to know why the majority has O: I do not know , but maybe somebody else in the forum knows... Edited November 17, 2012 by Jens Link to comment Share on other sites More sharing options...
dmaiski Posted November 18, 2012 Share Posted November 18, 2012 i would hazard a guess that having no antigen is cheaper (in resources) then having an antigen also mothers occasionally produce IgG antibodies against foetal blood, which cross the placenta (may cause miscarriage), and since O type has no antigens it is the "safe" blood type don’t quote me on this though its just a guess... Link to comment Share on other sites More sharing options...
overtone Posted November 19, 2012 Share Posted November 19, 2012 The "positive" or + designation refers to the presence of "Rhesus factor", a certain kind of protein in the membrane of most people's red blood cells - O+ blood has the antigen, and sensitized people of any ABO type who lack it (such as Rh- people who have been pregnant with an Rh+ fetus, or received a previous transfusion of Rh+ blood) will suffer adverse reactions to transfusions of O+ blood (or any other Rhesus positive blood regardless of ABO type) which can be severe. Rh- mothers will often create an immune reaction against (and inside) second or subsequent Rh+ fetuses (the first one sensitized their immune system, like a vaccination), and this special concern is one of the differences between Rhesus factor and the blood type factors of the ABO system. The persistence of Rh negative populations (mostly among northern Europeans and their descendants) in a world of people mostly Rh positive, despite this targeted risk to reproduction, indicates by presumption the likelihood of advantage of some kind. Link to comment Share on other sites More sharing options...
alpha2cen Posted November 22, 2012 Share Posted November 22, 2012 Does chimpanzee have the same blood types as humans them? Link to comment Share on other sites More sharing options...
alpha2cen Posted November 22, 2012 Share Posted November 22, 2012 (edited) Post #5 dose not mean chimpanzee or gorilla to human blood transfusion. Do not get it wrong. Edited November 22, 2012 by alpha2cen Link to comment Share on other sites More sharing options...
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