Discussion
A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive, and O positive. The blood group of the adopted son is
Answer: A
The adopted son is the one with O positive blood.
The parents are AB and O. An AB parent passes on either A or B, and an O parent passes on O, so every biological child must be group A or group B - never O and never AB. The son with group O therefore cannot be theirs.
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