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In short, the blood types across the continent of Africa are varied and it does not have the highest prevalence of any one blood type. 45% of South Africans have Type O blood, but this is not the highest prevalence (nearly 100% of South Americans have Type O blood). Type O+ blood is the most common across the continent of Africa, but it does not have the highest prevalence in the world of this blood type. In this synopsis, Type A has the highest prevalence in Europe and Central Europe, Type O has the highest prevalence in the Americas, Type B and Type AB have the highest prevalence in Asia. The listing of blood type percentages simply lists the continent where each blood type is the most common.
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Question: Why is Africa excluded from your article's world analysis?Īnswer: Africa is not excluded from this world analysis. Each type varies by geographical region and ethnicity. There are competing theories on blood type and evolution. Both the A and B types may become O with a few mutations, so it is likely that A is the oldest, followed by O or B. While the O blood type is universally compatible, it is not likely to be the oldest blood type among humans. The chance of this family having a child with the O blood type is 25% - there is a 50% chance they would have a child with the AO genotype (which would have the A blood type) and a 25% chance they would have a child with the AA genotype (A blood type).Īnswer: According to the BBC, type AB is the most recent blood type in humans. If she marries another heterozygote AO carrier, there is a chance that one of their children would inherit both O genes and then have the O blood type. In this case, she expresses the A blood antigen, but she also has a gene for the O blood type. Another way this can happen is if the parents are heterozygous for the O allele: this means the mother may be blood type A, but her genotype (the genes she carries) are really AO. If both parents are blood type O, all of the children in the family will have the O blood type. Two other patients, however, died after milk was transfused into their veins.īlood types A and B are co-dominant, so if the father has blood type AA and the mother has blood type BB, the child will have a blood type of AB.īlood Type O is recessive, so a child will only have this blood type if he or she gets two O blood type genes from his or her parents. This belief was erroneous, of course, but they had success with one sick man who responded favorably to the transfusions. Bovell and Edwin Hodder started intravenous transfusions of milk in the belief that the fat molecules in milk could be transformed into white blood cells, and that white blood cells were an immature version of red blood cells. The transfusion of cow’s milk was attempted in 1854 in Canada, during a cholera epidemic. Some scientists attempted to prevent the adverse reactions to blood transfusions by transfusing blood substitutes. Other people, however, simply went into shock and died after blood transfusions. Sometimes they were successful: in 1818 James Blundell managed to accomplish the first successful human blood transfusion, and saved a woman hemorrhaging from childbirth. As there was no understanding of blood groups, blood transfusions were extremely risky.
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Unfortunately, the move to human transfusion was quite tricky.