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It is impossible to say with certainty, but the 2 possibilities are type B neg or O neg. The answer depends on whether the father is homozygous or heterozygous for B. In other words, he could have the genes BB or BO, and therefore either contribute just a B, in which case the child would have genotype BO and phenotype B, or the father could contribute a B or and O (if he is genotype BO), and then the child could be either B or O. The child should definitely be Rh-neg.

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15y ago

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