GyanGramA married couple adopted a male child, A few years later; twin boys were born to them. The blood group of the…
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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 -
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• Correct Answer: A
• AB parent can pass only A or B alleles; O parent passes only O allele. Biological children can only be A or B.
• The O positive child must be adopted since AB × O cannot produce blood group O offspring.
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