How is it possible for a child to have a blood group O if the parents have blood groups A and B?
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if genotype of one parent is IAI and that of another parent is IBI. then gamates from the parents can have any one of genotypes, IAI or IBI or I. if fertilization happens gamates with I only. Then the child genotype will be II and hence the child can have blood group O.
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A mother who is blood type O can only pàss an O allele to her son or daughter. A father who is blood type AB could pàss either an A or a B allele to his son or daughter. This couple could have children of either blood type A (O from mother and A from father) or blood type B (O from mother and B from father).
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