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Thread: The Distribution of Blood Types

  1. #1

    The Distribution of Blood Types

    As everybody knows, there are two blood antigens: A & B. People who don't have either are called O. The system is called ABO. There is one other antigen that is called Rh. If you have this antigen, you are Rh+. The distribution of these antigens around the world tells a very interesting story. Here are three maps from http://anthro.palomar.edu/vary/vary_3.htm


    Distribution of B type blood allele in native populations of the world


    Distribution of A type blood allele in native populations of the world


    Distribution of O type blood allele in native populations of the world

    The article concludes that the distribution of ABO don't seem to be related to racial types, suggesting that the forces that resulted in the gross differences in distribution of blood types are not the same as those that resulted in skin and other racial characteristics (height, weight, facial features, etc.).

    Note that the populations represent the "native populations" and not the people who have migrated there. The pattern therefore represent the people who migrated to these parts of the world at any earlier time.

    The B blood type has the most lopsided distribution. It is essentially absent from the Americas and Australia, meaning that the people who migrated there early did not have B blood type. It is also remarkably prevalent in central Asia and Northern India, as in Siberia close to the Arctic Circle. About a quarter of people in China have the B-type. From this, one might conclude that the B blood type was most prevalent in Central Asia and spread from there into China but definitely did not penetrate to the Americas or Australia.

    The A blood type is also quite lopsided, prevalent in places where the B-type is rare or missing. So, for example, the A type is prevalent in parts of North America, Greenland, and Scandinavia, and strangely in Australia. It is also relatively common in Europe. But, it is the O-type that is the most telling. Nearly 100% of all people in South American are O-type and it is remarkably prevalent at 80-90% of North America. It is virtually absent from central Asia and China.

    The A and O distribution suggest strongly that the original wave of people who migrated to the Americas were O-type, possessing neither A nor B. An alternative possibility is that none of the people that migrated were B, most of the people in the first wave that had A died, were unable to breed, or were otherwise selected out. However, the second wve of people clearly possessed the A blood type. The fact that there were almost no B's in the native populations of the Americas suggsts strongly hat the population of native Americans did not come from central Asia but came from a subpopulation of people who lived in Northeastern Russia.

    It is also interesting the Southeast Asia has an ABO distribution that is quite different from China and is more like the native populations of India. So, for exmple, the B type is quite prevalent in India and SE Asia. The A type in SE Asia is similar to that of South India. And, its distribution of O-type is similar to South India. This suggests that most of the people in SE Asia come from South India and not from China. By the way, I have a B type blood. This is consistent with my Chinese origin and suggest my earliest ancestors may have come from central Asia.

    Wise.

  2. #2

    The distribution of light hair


    The distribution of light eye colors

    http://pages.globetrotter.net/peter_...-eye-color.htm

  3. #3

  4. #4
    RH - here how is that possible??

  5. #5
    Quote Originally Posted by Jodie Lynn View Post
    RH - here how is that possible??
    I do't understand your question. Rh- would mean that you don't have that antigen. Rh+ means that you have the antigen. Wise.

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