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by mike Rooney on January 12th, 2006

mike Rooney

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Both my parents have A positive blood, and I am O negative. Is this possible?

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  • by Erin Albrecht on January 14th, 2006

    Erin Albrecht

    Yes, this is possible.

    The four bloodtypes (A, B, AB, and O) can be represented as follows:

    A = AA, AO
    B = BB, BO
    AB = AB
    O = OO

    If both your parents are AO, then there is a 1/4 chance for you to have type O blood. If either parent was AA, then it is impossible for you to have type O blood.

    The Rh factor (the positive or negative) can be represented as follows:

    Positive = Rh+Rh+, Rh+Rh-
    Negative = Rh-Rh-

    So, if your parents are both Rh+Rh-, there is a 1/4 chance for you to have Rh-Rh- blood.

    When you put both the bloodtype and the Rh factor together, it is entirely possible for you to have O negative blood.

    Please see these other answers for more information:
    http://www.answerbag.com/q_view.php/16667
    http://www.answerbag.com/q_view.php/37780

    Comments

    • this is great info, keep it up!

      davoomac

      by davoomac on April 21st, 2006

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