Probably most of them. Usually from family lore that is mostly true.

Genetic studies (including the Human Genetics Project) has indicated that 95% of all Black Americans have some European (White) ancestry, with the average amount being about 25% White Heritage. Genetic Markers from the White ancestry indicate mostly Anglo-Saxon/other Germanic with British Isles Celt (Scottish/Irish/Welsh/Cornish), and Scandinavian components. In other words, typical Southern American White source is indicated.

A study of the genetic markers on the X and Y chromosomes indicates that most of the White genetic input to the Black American gene pool was from White males, probably as a result of slavery.

It was also found that 75% of Black Americans have identifiable North American Indian genetic markers of varying amounts (mostly from the Southeastern Tribes, particularly the Cherokee, Blackfoot, Muskogean, and Creek tribes). The amounts and specific tribes vary with locality of the Indian population.

Studies of genetic markers on the X and Y chromosomes indicates input to the North American Indian gene pool was from Black American males, most likely runaway male slaves who could also have some White ancestry (see above). These runaway slaves were normally adopted into the Indian Tribes.

blood types are changing and ww3 a major conflict if it occurs sees Russia kill more o types and a types in favour for Asian b types , facts are more o types and a types have been killed in Ukraine's war with Russia on both sides that sees b type become untouchable that echo's , India and china resolve against Europe , med sea and Africa .

“b types seen as invisible until its overtakes a types and a major war occurs”

“b Type high country's have nuclear weapons”

its not something new many wars have occurred where b types have waged against o types since the Greek Persian wars to Mongol conquests of Europe and Russia war in Ukraine that sees more o type killed and more a types killed in favour for money and politics of the future of Russia , country's are not using their nuclear weapons for protection for o type and a types but rather more money and politics that would likely see more a types and o types killed in any ww3 that would occur .

b type wars are rash and start in a instant and most wars begin with actions of how b type work with fast and rash wars , pearl harbour , 9/11, Russian Ukraine war , Iraq war can be attributed to how b types are , they don't show any dialogue but simple action , and yes b types are increasing and would overtake o types and a types and bring a much larger conflict of natures .

arms in Ukraine may lead the USA into confrontation with Russia and the USA goes to war using article 1 of the constitution that allows wars to occur , Iraq war occurred by article 1 in the USA constitution to fight terror in Iraq and Afghanistan, any Russian attacks on Lithuania , Poland , or Nato country's do such and bring USA Into full confrontation , for protection of o types and a types in Ukraine.

with only 300 million people until b types overtakes a types its a world milestone that showed blood types can change and wars do occur when blood types change

• b types for the world - 1.99 billion 24%
• a types for the world - 2.300 billion 29%

“Armenia and Azerbaijan Conflict can seen as a b type and a type conflict that is spurred from India and Iran “

Image shows country's that pro o type and pro b type with conflicts created for no reason and Pakistan and India huge surge in b type towards 40%,egypt sees increases of b types from Arabia, and Azerbaijan wars in Armenia a pro a type and o type area, in my opinion country's like Egypt and eastern Africa should nuclear weapons to deter b type country's in expansion of b type

“huge mistake by EU in not monitoring b type increases with bad immigration and favour of b types”

EU politics in the last 30 years In fall of east Germany sees more pro Arabian and pro b types in Arabia that pushed India's and Pakistan's b types to above 40% a new milestone in India is imminent, Arabia is around 29% b type from India from their culture and historical past not like med sea country's like Egypt and Algeria and western turkey.

According to which typing system? There are more than 30 “blood types” that we know of.

The most common system that most people know about is the ABO and Rh system. While people can have more than one “type” of blood at a time, depending on which system you look at, in the ABO and Rh system, each person has only one variation of those types. When a different type is introduced into the blood stream, in most cases, it causes blood clotting and possibly death. Care is taken when giving transfusions to be sure that the wrong combination doesn’t get into the blood vessels.

In the ABO and Rh system, there are eight different types, but they are named in two groups — A, B, AB, and O are one group, while the Rh group is either positive (+) or negative (-) for the presence of a particular molecule on the outside of each red blood cell. The most common blood type worldwide is O+.

• O positive: 35%
• A positive: 30%
• O negative: 13%
• A negative: 8%
• B positive: 8%
• B negative: 2%
• AB positive: 2%
• AB negative: 1%

O negative can be given in a transfusion to any other type without causing a bad reaction and is often called the “universal donor”, while AB positive can receive any other blood type without bad reactions. Different geographic populations around the world have different percentages of blood types, because blood type is something inherited by genetics. This difference in percentages by geographic distribution is very gradually disappearing as groups of people move and settle in different places to have children with people from different groups. In theory, eventually the geographic percentages will be the same all over the world, but this will be a very slow process.

blood and humans are close to a new era of b type dominance in the world with Europe and India and Americans that see major b type increases in the world , during the 1920 b type blood was around 8–11 % with major booms in India china and south eastern Asia saw major increases , Europe was no exception where b types increased in every European country in the last 20 years with Sweden seeing over 15% b types

“American is no exception with major increases in b types in California from Asian south Korean , Chinese and Indian populations”

“more o types and a types killed in Israel and Gaza conflict”

“India to reach 50 % b types in the future around 700 million b types in India”

“Pakistan to follow with 40% b types imminent “

”Arabs high in b type from India”

“around 100 million native b types are in Europe and may increase with dominance”

Europe respects b types migrations more and give no thought to their own migrations towards Americans as o types and from African expansion from eastern Africa where major o types came from . native Americans were o type the same blood type as European Americans and Americas are a very high o type area with brazil natives around 98% o type blood. Europe respect for b type migrations has decreased their own a types dramatically.

“blood types should be on documentation”

“crimes are attributed to o types and a types in certain areas around the world”

• African Americans around 20 b type
• white Americans around 16 % b type
• Asian Americans around 27% b type

“major states such as new York , California Texas sees major increase in b types “

blood type a is set to decrease below b type for first time in its history

• a type for the world around 2300 million
• b types for the world around 2000 million

aspects of priority of health care when few b types live , often areas in health care need b types more to give blood that give them more protection and priory than o types and a types in a area and if they do a crime they are treated as o type and a types.

Because in many parts of the world it is assessed when clinically necessary and even then many may not be told it and if they are, remember it. It isn’t a big deal unless further treatment rolls from the info or you are a blood donor - then the memory aid of a card.

I can’t imagine that if you are recovering say from a trauma that required transfusions the first thing on your mind when finally being well enough to have a conversation is “Hey nurse what was my blood group?” Nor to greet your relatives with the startling, “Good to see you Mum, BTW some exciting news I’m O positive!”

Pregnant woman with a Rh-negative status get told in circs that they need to hear and remember the info because they will have prophylaxis treatment rolling out from that. However even then I have friends who know they are “negative” but can’t recall anything else - and now women are also tested for their K antigen status (Kell blood group system). How many pregnant women do you know who know their K status?

Where I do think there is a lack of realisation that it may be a clinical necessity is women going on the contraceptive pill. O is “protective for thrombo-embolic events” is the usual phrase because of lower levels of blood cotting factors, AB is high. If you have a parent who has had a thrombo-embolic event and you are going on the pill - get your ABO group “typed”. I had a suspected pulmonary embolism in my late 20s and the GP took me of the pill immediately. Only later did I find out the extra possible connection of a) my blood group and b) my F’s DT when a young man (Army). The research at the time on the differing von Willebrand factor levels across the ABO groups was in its infancy.

Blood types are determined by the type of proteins that are found on the surface of red blood cells.

If you start with an ancestral state where there is just one type of these proteins, then you have a single blood type in the population.

If any random mutation occurs to that protein’s gene, then immediately you get two blood types in the population.

So long as the new mutation is functionally neutral, it will spread to a certain degree within the population, via the mechanism of genetic drift. So long as it persists within the population, the population will have two blood types. If a third neutral mutation occurs to the blood type protein gene(s), then you immediately get a third blood type in the population.

Thus the simple fact of having multiple blood types can be explained by simple chance. Given enough time, and the inevitability of mutations, multiple blood types must eventually arise so long as neutral changes are possible in the blood type gene(s). We would only expect there to be just one blood type in the population if the blood type protein was functionally so vital and so constrained that all variants to it are massively disadvantageous, allowing naturally selection to rapidly eliminate all the mutants whenever they arise.

Is that it then?

When we examine the frequencies and distributions of the different blood types in the human population, we find that the numbers do not match exactly what we would expect if the blood types were all wholly neutral and spreading randomly through the population via genetic drift.

This is a hint that something more than genetic drift, ie natural selection, is at work in affecting the frequency and distribution of the blood type alleles in the human population.

It turns out that the different blood types have different relative vulnerabilities and resistances to different types of diseases. Natural selection is at work on two fronts here. Infectious organisms that attack red blood cells may evolve ways of identifying/binding or otherwise exploiting the cell surface protein (ie the blood type marker). Meanwhile, humans may evolve to evade/thwart these potential pathogens by changing the blood-type proteins that the pathogens have evolved to exploit.

Thus if a certain strain of, say, malaria, evolved to exploit blood type A proteins very effectively, the appearance of a new mutation that transforms blood type A into blood type O may confer resistance to that strain of malaria.

In an isolated system we might expect that with this kind of selection pressure, over time type O will rise in the population and perhaps even displace type A entirely.

But in real life the system is not isolated. There are other pathogens out there. And these are also evolving. And some of them may evolve to exploit type O blood.

Over time, different strains of various pathogens evolve to exploit different blood types, such that each blood type carries with it both resistances and vulnerabilities to different pathogens.

A cyclical arms race develops. If the population in a certain region encounters many pathogens well adapted to exploiting type A blood, but to which Type B conveys resistance, then over time Type B will rise in the population and Type A falls. As Type A falls, however, the pathogens able to exploit Type A individuals find fewer hosts, and their numbers also fall, becoming less and less of a selective threat to the population. When Type A falls low enough, and Type B rises high enough, suddenly it is the previously rare pathogens who can exploit Type B blood that find it easy to spread in the population, and the selection force against Type B blood that they provide rises. This causes Type B alleles to fall in the population, while Type A starts to rise again.

The same sequence of events happens simultaneously with all the other blood types, in all the other local populations of humans around the world. At any given time, the rarer blood types tend to have a selective advantage, because, by lieu of their rarity, the pathogens that exploit them are also rare, while the pathogens that they provide immunity to are common. But, thanks to that advantage, their numbers rise due to natural selection, and once they become more common, their selective advantage disappears, as the pathogens that exploit them also rise in turn, to exploit the increased number of susceptible hosts. As a result, no single blood type is ever able to rise to fixation in the population, displacing all the others, and multiple blood types co-exist in a stable equilibrium, rising and falling against one another as the pathogens that exploit them change in turn.

Here are some methods for knowing your blood type-
1) A self evaluating blood type testing kit

These are single time use and can be easily bought online.
2) Go to your physician, he may know or will get a blood test done for you
3) And my personal best way, Donate blood

4) also, you can go to your nearest blood service centre (or a pathology lab) and ask them to take your blood test.

Mainly in case you need blood.

I doubt any medical professionals these days simply trust the patient’s assurance that they have type A or whatever. Now that there is the technology to rapidly test even an unconscious patient’s blood, I suppose it doesn’t matter too much whether you know yours or not. For safety’s sake, even if you can tell them your blood type, they would probably rather give O- blood, which is called the “universal donor” type since it is compatible with any other blood type.

Military ID (at least once upon a time, not sure about in modern times, although it seems a person could be chipped with such information) noted the blood type of the serviceman/servicewoman. Military people are much more likely than others to be hurt in such a way that extreme blood loss might be an issue, and the technology for cross-matching blood types hasn’t necessarily always been fast enough (or even available, sometimes) in field hospitals. Famously, Hitler’s SS troops had their blood types tattooed on their left arms.

Some people believe that your blood type determines facets of personality. Some believe that it determines the optimal diet for a person. There has been some correlation, since the pandemic, between blood type and likelihood of catching CoViD/likelihood of better or worse outcomes.

Before DNA testing became ubiquitous, blood typing was sometimes used to determine whether it was possible that a particular person was the parent of a child. (It couldn’t say that a person WAS a parent, but it could be used to exclude some people from possible parental relationship with a child.)

Knowing the blood type of a pregnant woman and her child is still important these days. Although the ABO type doesn’t matter very much, the Rh factor does. If an Rh-negative woman gives birth to an Rh-positive child, serious complications can occur in later pregnancies.

Some people want to know just out of curiosity.

There may be something I am forgetting, but I the reasons for a person knowing their own blood type are few these days.

The names of the blood groups of the ABO blood group system were settled on by the Health Committee of the League of Nations with recommendations from the scientists involved in the research. They were adopted by various national bodies and by the 1950s were universal.

There was a complex history of the nomenclature from the early discovery by Landsteiner in 1900 of some of what we now know as the ABO system, different scientists were working independently and in parallel so different names were used, including at one point a number system. You can read about some of that history here,

The International Society of Blood Transfusion now takes responsibility for naming blood group systems and antigens via its then working party, now a committee, established in 1980 on, Red Cell Immunogenetics and Blood Group Terminology

If you scroll to the bottom of the webpage you can follow the links under “Blood Group Terminology” and read the criteria for classification.

There are currently 43 blood group systems and over 380? red cell antigens.

There is still some disagreement as to whether the O is an 0 (null/zero). The history is clear that in the final committee rounds (late 1930s) between League of Nations and the US National Research Council Landsteiner recommended the letter O, for the German ohne, which means “without”. However the convention in Europe appears to be to write O and say “null”.

Rh null. Only about 50 people worldwide have it. The ABO blood system is the most common. As you can see the Rh null is not included in this graph but O- blood type is the closest type to Rh null as it also has no antigens within the ABO system. It does however have some antigens so far removed from the ABO system its not worth mentioning. Cheers.

It varies from one country to another.

O+ is by far the most common blood type but, as you can see it also varies based on ethnic background.

AB, A, B, O, Rh positive and Rh negative are the eight main blood types. Blood group A even has a sub type that can be Rh positive or Rh negative. Then there's the hybrid positive Rh factor (+/-) that's silent recessive for Rh negative, since we inherit two blood type alleles and two Rh factors, one each from each parent. So, just within our eight main blood types there's AB (+/+), AB (+/-), AB (-/-), AA (+/+), AA (+/-), AA (-/-), AO (+/+), AO (+/-), AO (-/-), BB (+/+), BB (+/-), BB (-/-), BO (+/+), BO (+/-), BO (-/-), OO (+/+), OO (+/-), OO (-/-). Then there are rarer blood types like Duffy, Kell, Bombay, and Rh null. One concerning thing I've noticed is, Type O positive is winning the blood type war as the most common blood type as couples with different blood types interbreed. Certain studies have shown this is also the least fertile blood type in women (FSH levels are higher at a younger age and egg counts are lower). Here are the current blood type percentage estimates in the USA where shots like Rhogam for blood type incompatibility are widely used in pregnancy, especially when the mother is Rh negative and her unborn is Rh positive (her unborn is actually Rh hybrid positive (+/-) since we inherit two blood type alleles and two Rh factors). In natural childbearing without man made interventions, it's ideal for mother and unborn(s) to have matching blood type compatibility for safer pregnancies. Childbirth is a dangerous time for women and babies for different blood types to mix. It's too bad sexual attraction doesn't exclusively match it's own blood type in dating. From these percentage estimates, it's obvious that everyone born in future generations will eventually have an Type O positive blood type, as all other blood types are being snuffed out by Type O positive in the great melting pot. That's not necessarily a good thing, and I think this deserves our full attention and further studies. Do you see the imbalance in our blood types?

I feel I should write a Fermat-like disclaimer “This internet is not wide enough for a full description of human genetics” but here’s a simplified answer.

Diversity arises through random selection. A, B and O are relatively small differences in the structure of a cell surface marker. At some point, O & B arose through random mutation from A. Having arisen - then what? If a mutation has a negative survival value, it is selected against and tends to die out. If it has a benefit, it tends to spread through the population. If it's neutral, then it’s like is like tossing a coin - might do either.

They're doesn't seem to be any significant overall drawback to having A rather than B or O (though there are some diseases associated with each) so none has become predominant. The prevalence of the ABO groups vary from area to area - this might be chance or might represent some local advantage. For example, sickle cell trait confers some resistance to malaria and hence is of value in areas where malaria is prevalent - parts of Africa, Asia and Central America but not in Canada, New Zealand or the UK. Sickle cell gene is therefore commoner in people whose ancestors lived in those areas where there was selection FOR the gene but elsewhere there was selection AGAINST it.

When I was a patient at a British state hospital I asked my doctor what blood type I was and he refused to tell me claiming if I knew I could use it to circumvent certain legal procedures, such as if I was required to give blood for it to be tested for some reason, such as to determine if I was the father of child, then if I knew my blood type I could get someone else of the same blood type to pretend to be me and give a blood sample.

PS, My local state GP refused to let me see my medical file.

PPS, This is just two examples of why countries shouldn't have a state health care program such as britains, as when it's run by the gov they can do whether the fuck they want and you can't do shit about it as they cover everything up and lie about everything.

Human blood types most likely came to exist to fend off infectious diseases. The incompatibility of some blood types, however, is just an accident of evolution.

There are four main blood types. Blood type A is the most ancient, and it existed before the human species evolved from its hominid ancestors. Type B is thought to have originated some 3.5 million years ago, from a genetic mutation that modified one of the sugars that sit on the surface of red blood cells. Starting about 2.5 million years ago, mutations occurred that rendered that sugar gene inactive, creating type O, which has neither the A or B version of the sugar. And then there is AB, which is covered with both A and B sugars.

These sugars are what makes some blood types incompatible: if blood from a type-A donor were given to a person with type-B, the recipient's immune system would recognize the foreign sugars as an invader and cue an attack. The resulting immune reaction can kill. Type O-negative blood is known as the "universal donor" because it lacks the molecules that would provoke that reaction.

If you want to know more.. see this: Why Do We Have Different Blood Types?

One system of blood group antigens is the ABO group, and that system is complete as is. There are unusual variation of some of these antigens, and there an exceedingly rare situation where no ABO antigens are made. This is referred to as hemoglobin H, and it is mostly confined to India.

The Rh system contains a very complex variety of antigens, but here only a single antigen determines Rh positive vs. Rh negative. That doesn’t mean the some of the atypical Rh types can’t bite you in the ass.

There actually a few dozen other systems out there that can cause real problems. Are you Kell positive or Kell negative? Are you Duffy positive or Duffy negative? There are lots of other similar blood systems. You will never hear of these antigens unless they cause you a problem.

Yeah, it’s a lot more complicated that just A positive.

Blood types are primarily dictated by sugar decorations on proteins. Specifically, N-acetylgalactosamine for the A-type and galactose for the B-type. The O type is the complete absence of either sugar decoration. Could a new blood type arise, yes quite possibly it could. In other animals besides apes there are many different blood types. Pigs for example have a couple of incompatible blood types with humans. The primary incompatibility is alpha-Gal. This sugar decoration is a produce of a particular gene that is expressed in the porcine genome. In the primate lineage leading to humans, this gene has been rendered inactive and no longer expresses. Thus we as humans do not have the alpha-Gal blood group.

It is quite possible that a new sugar decoration could exist in someone, conferred by the expression of a new gene. It would only take one such instance for the blood group to come into existence too. If that human procreated and their children inherited the gene that conferred the new blood group, then there is a chance this new blood group could grow and thrive.

Evolution is driven by positive and negative pressure. if the new sugar imbues some benefit to survival or some advantage in procreation, then it would surely increase in likelihood. However Humans aren't really governed by evolution anymore, so in this period of human evolution, it is very unlikely that a new blood group would have a distinct advantage, at least one that would allow the new group to thrive in comparison to other groups.

Take A/B vs O, in Malaria infested regions, O has a distinct advantage because they are more resistant to the malaria infection. Thus an O blood type is more likely to survive and procreate. It is unlikely a new blood group would have such an advantage over the current A/B mix. This dynamic of course would change if a disease that takes advantage of A or B to get a foothold for disease propagation. If your new blood group was resistant, then it would surely take off, as the A/B blood types died off to the new disease.

Hope this helps