If a boy receives type A allele from his mother and type B allele from his father, he will have Blood.

A mother who is blood type O can only pass an O allele to her son or daughter. A father who is blood type AB could pass either an A or a B allele to his son or daughter. This couple could have children of either blood type A (O from mother and A from father) or blood type B (O from mother and B from father).

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B allele from his father

Explanation: He will get B allele from his father because males are dominant and females are resilient

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