A woman with B type blood has a child with O type blood.We would conclude that,with respect to the gene for ABO blood type,the mother was:

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This can be explained through the laws of inheritance for ABO blood group. Since the mother has B type blood and she is able to have a child with type O blood, this means that she has one B allele and one O allele. Therefore, she is heterozygous for the ABO blood type gene.

A Woman with B Type Blood Has a Child with O