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Blood group A phenotype can be as a result of AA or AO. Going by Mendelian rules of inherittance,

Group A father can be AA or AO and,

Group A mother can be AA or AO.

IF parents are AA & AA then all children will be AA = Group A only.

IF one parent is AA & the other AO, then the children can be AA,AO,AA,AO = Group A only phenotypically.

IF both are AO & AO, then the kids can be AA,AO,OA (all = Group A) and OO = Group O.

So depending upon if the parents are AA or AO, the children can only be Group A or Group O (when both parents are AO).

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16y ago

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