Discussion
If one of the parent is of blood type A and the other is type B, the sibling would have the following blood types :
Answer: D
If one parent is of blood type A and the other is type B, the children can be AB, A, B or O, depending on whether each parent carries an O allele. The option that covers all the possibilities listed is therefore right.
AB alone, B alone or O alone would each leave out other possible outcomes, so no single option is complete. The listed types (AB, B, O) are all possible, hence 'all of the above'.
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