What can be the blood group of offspring when both parents have AB blood group ?
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Hey mate here is your answer.
The IA allele gives type A, IB gives type B, and IO gives type O. As both IA and IB are dominant over IO, only IO/IO people have type O blood. Individuals with IA/IA or IA/IO have type A blood, and individuals with IB/IB or IB/IO have type B. IA/IB people have both phenotypes, because A and B express a special dominance relationship: codominance, which means that type A and B parents can have an AB child. If both the parents are AB then their genotypes will be IA/IB and this combination cannot give rise to O blood group.
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Each biological parent donates one of their two ABO alleles to their child. A mother who is blood type O can only pass an O allele to her son or daughter. A father who is blood type AB could pass either an A or a B allele to his son or daughter.
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