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Furthermore, a prevalent Middle Eastern ancestry of the modern population of the marshes of southern Iraq implies that if the Marsh Arabs are descendants of the ancient Sumerians, also the Sumerians were most likely autochthonous and not of Indian or South Asian ancestry. Overall our results indicate that the introduction of water buffalo breeding and rice farming, most likely from the Indian sub-continent, only marginally affected the gene pool of autochthonous people of the region. On the other hand, a more ancient background shared with Northern Mesopotamia is revealed by the less represented Y-chromosome lineage J1-M267*. No matter how current the Celtic research might be, there is no denying that Sumerians need to be looked at in terms of possibly having been the original rh negative people.Įvidence of genetic stratification ascribable to the Sumerian development was provided by the Y-chromosome data where the J1- branch reveals a local expansion, almost contemporary with the Sumerian City State period that characterized Southern Mesopotamia. High percentages in the R-M269 marker usually equal high frequencies in rh negative blood. 10, 2021 by Rachael Rettner.Examining groups with high frequencies of rh negative blood always leads back to the Celtic DNA. This article is for informational purposes only, and is not meant to offer medical advice. There are also at-home blood tests that can tell you your blood type. You can also find out your blood type if you donate blood, according to the Cleveland Clinic. If they don't, you may be able to request blood typing the next time you get your blood drawn, according to CNN. If you don't know your blood type you can ask your health care provider if they have a record of it. Those with Rh-negative blood can be treated with a drug called Rh immunoglobulin to prevent a damaging immune reaction if their fetus has a positive blood type, according to the Cleveland Clinic. For this reason, pregnant women have their blood tested to determine blood type. (The fetus can inherit the Rh factor from either the mother or the father.) That's because, in this situation, the mother's immune system can react to the fetus' "positive" blood. Blood type and pregnancyīlood type can be an issue in pregnancy if the mother is Rh negative and the fetus is Rh positive.
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But in some rare cases, blood type has been known to change, including in cases of bone marrow transplants and in people who developed certain types of cancers or infections, according to the Cleveland Clinic. Can blood types change?Ī person's blood type does not usually change, meaning it stays the same throughout life. One of the rarest blood types in the world is known as "Rh-null " fewer than 50 people in the world have been found to have this blood type, earning it the name "golden blood," the Cleveland Clinic says. Specifically, rare blood types are those that are found in 1 in 1,000 people or fewer. A person's blood type is rare if their blood does not have an antigen that most people have, or if their blood does have an antigen that most people lack, according to the Cleveland Clinic. What are "rare" blood types?Īlthough ABO and Rh groups are the most important blood groups for transfusions, there are hundreds of other antigens that have been found on the surface of people's red blood cells. In particular, type O-negative blood is in high demand because it's the one most often used for emergencies, when there may not be time to determine a patient's blood type. Type O blood is often in short supply in hospitals, due to demand for this universal donor type, according to the Red Cross. People with type O blood are called "universal donors" because this type can be used for patients with any blood type. (Image credit: Getty Images / mailsonpignata / 500px) "Universal donars" are people with type O blood, and this blood type can be incredibly useful during medical emergencies.
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A person's blood type is designated as "positive" if they have the Rh protein on their red blood cells, and "negative" if they don't have this protein. Individuals with type AB blood have both people with type O blood have neither.Īnother protein, the " Rh factor" - also known as the "Rhesus" system - is also present or absent on red blood cells. Two of the main antigens used for blood typing are known as "A antigen" and "B antigen." People with type A blood only have A antigens on their red blood cells and those with type B blood have only B antigens. A person's blood type is based on whether or not they have certain molecules or proteins - called antigens - on the surface of their red blood cells, according to the National Institutes of Health.