How can two parents have type A blood but there son have type o

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Grade: Education Subject: chemistry
How can two parents have type A blood but there son have type o
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Hope this helps. Two parents with B blood type can produce a child with either B or O blood type. One parent with A and another with B can produce a child with A, B, AB or O blood types. If one parent has A and another has AB, they can either produce a child with A, B or AB blood types.