HEREDITY
INCOMPLETE DOMINANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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AB
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A
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B
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O
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Detailed explanation-1: -In most cases, an O parent and an AB parent will have only A or B kids. I added a table at the end of this answer that has all blood type combinations for two parents plus the possible blood types for their children. Exceptions to these rules are extremely rare.
Detailed explanation-2: -If the father’s blood group is O, he has the genotype IOIO or (ii) . The mother has blood type AB, which means that her genotype would be IAIB. The possible combinations of these two groups would result in children having genotypes IAIO or IBIO, which would give them blood groups A or B respectively.
Detailed explanation-3: -Can an AB father and an A mother have an O baby? An AB parent can indeed sometimes have an O child. But it is by no means common. In fact it would be fair to say that it is exceedingly rare.
Detailed explanation-4: -This would give the children the phenotype or traits that show, (in this case blood type) A & B, respectively. As both parents are Rhesus positive (+), all children would be too. So their children would either be A+ &/or B+, with no other possible blood group.