I enjoy blood type O rhesus denial. Neither of my parents have this irregular blood group. How did I acquire it?
Answers: Math_prof is right, except I think that both your parents hold to be negative for you to achieve the negative Rh factor. This is why women next to negative blood types who enjoy husbands with positive types want to receive injections during pregnancy, so their bodies will not attack the positive blood type of the baby.
The milkman probably have o rhesus negative..
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