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[–]kwallio 5 insightful - 1 fun5 insightful - 0 fun6 insightful - 1 fun -  (0 children)

Isn't this the same question that was recently posted just reworded? What hair color/skin color delineates/decides male or female, pray tell.

OK, cool. So then ABO blood group is binary because there are only two antigens.

This is like, the dumbest thing ever. The abo blood type is specifically NOT binary, it typically used in science classes as an example of incomplete dominance, aka a non-binary genetic system.