In humans, blood type A and B are incompletely dominant, while blood type O is recessive to both A and B. On another chromosome pair, Rh + factor is dominant, while Rh- is recessive. Raoul is type A and Rh +. His mother is Type 0, Rh-.
He marries Drusilda, who is type AB, Rh -, What kind of blood types can their kids have?

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