QUESTION

Hard

Science & Technology

Prelims 2011

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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Explanation

Given the parents' blood groups are AB positive and O negative, their biological children can only have blood groups A, B, or O (all possibly Rh positive or negative due to the O negative parent). Since the three sons have A positive, B positive, and O positive blood groups, and only the biological children can have these blood groups derived from the parents, the adopted son must have the O positive blood group, fitting the scenario as the child not biologically linked to the parents' genotypes.

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