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What blood type is the child with male O blood and female B blood?

The combination of type O can only be aaBB, and the combination of type B has aaBb and AABB. The recessive A of both sides can't appear dominant A (AABB, AABB). The dominant a of AB. Similarly, we can know that B on one side can match bb, Bb. The answer is: type O or type B, and type B is more likely.