The most authoritative answer in 2024
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Penelope Gonzales——Studied at the University of São Paulo, Lives in São Paulo, Brazil.
Everyone has an ABO
blood type (A, B, AB, or
O) and an Rh factor (positive or negative). Just like eye or hair color, our
blood type is inherited from our parents. Each biological parent donates one of two ABO genes to their child. The A and B genes are dominant and the
O gene is recessive.
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