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father's O+ and mother's group is B+, group of their child is AB+.
is it possible?

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sbkamboh

by sbkamboh on February 5th, 2010

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Answers. 3 helpful answers below.

  • Scotty S.
    Scotty S. Feb 5th, 2010 It's not possible. The "A" gene in the child had to come from somewhere, and it definitely didn't come from either the mother or the "father", in this case.

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  • Rin
    Rin Feb 5th, 2010 no definately not possible.

    O is recessive (unlike what 'answering5271' says - i am sure about this)... therefore if you're O it means that your father's genotype is OO.

    Your mother could be either BB or BO, as B is dominant.

    As you see, there is no possibility of an A gene, because A is dominant too.

    This means that for an AB child, one parent must have an A gene (eg AB, AA or AO) and the other parent must have a B gene (ie. AB, BB or BO).

    With the parent's combination you provided, there is no possibility that the child would be AB.

    However, it is possible that there was an error while the blood was being typed. So it would be wise to retype the parents and the child's blood to re-check things.

    i studied some genetics, so i know something about these things. hope this helped!

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  • answering5271
    answering5271 Feb 5th, 2010 Yes - B is recessive, so mother has 2 B genes. O is dominant, so father could have 1 O gene and 1 A gene, and it was the A that got passed on to the child. Combine 1 B gene with 1 A gene, you get AB blood type. Definitely possible.

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