Can a o positive and o negative have a b positive type?

No, unless there has been a genetic mutation in one of the parent; They are B, but a mutation makes them appear to be O --> link between sugar and blood cell is missing so appear O ( the absence...

yes

Yes, but only if the parents are heterophiles for the positive gene (each have one positive and one negative gene).

Yes, butonly if both parents have the negative gene, but have a positive blood type because they have both the positive and negative gene. A positive blood type is dominant and negative is recessive....

Absolutely. Even for myself. My mother is A pos and my dad O pos. I am A Neg. and proud of it. Also, The A is dominant and more likely to be the blood type over the O.