?
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no. If both parents are type O then they are both homozygous recessive meaning they have no dominant A alleles to pass on to their children so all of their children will be type O.
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No, both are homozygous recessive so the resulting offspring would be all OK children
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Yes, but it depends on the mailman's blood type.
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yes. in two possibility this can be happen in O+ BLOOD GROUP .
OO x OA+ = A+
OA+ x OA+= A+
OO x OA+ = A+
OA+ x OA+= A+