He is bloodtype A.
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he was a physicist
evangelista torcelli invented it! yay him.
He had blood type AB.
It is hard to tell if your blood type is dominate and your partners blood type is recessive them the child could have O positive blood, but if your blood type is recessive and your partners blood type is dominate then the child could have O negative. Sometime the child could get a completely different blood type eve if their parents do not have it. There is no way you can tell.
Type O blood is considered to be the universal blood type. This is because it does not have either A or B antigens on the red cells. It does however contain the antibodies for each one in the plasma.