Last night, I got to thinking about blood type. I wondered how come I have a B+ blood, when everyone in my family is O or A. I decided to go hunting on the Internet to see if I could learn something about where I come from using this tidbit of information.
It turns out, B-type people are universally less common than O and A.
I discovered that there is a high probability I have some Asian — Siberian, Mongolian, Chinese, Indian — ancestor. Genghis Khan made serious inroads into Europe and I am probably proof of it.
The incidence of type B is low amongst Jews. Low everywhere, really. It’s not unheard of, nor so infrequent as to be rare, but low. My mother was type O, the most common blood group everywhere. Among native peoples in the western hemisphere, type O is close to…
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