If both parents are O positive can child be A positive or A negative?

The child can only have type O blood. In the ABO blood group, A and B are dominant while O is recessive. All the possible genotypes are: AO, AA, BO, BB, AB, and OO. The first two are type A phenotypes and the next set of two are type B phenotypes. The Rh gene works similarly with positive (+) being dominant and negative (-) being recessive. If both O+ parents were heterozygous (+/- expressing only the + phenotype) there is a one in four chance that the baby will be O-.