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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

,

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?

(a)

O positive

(b)

A positive

(c)

B positive

(d)

Cannot be determined on the basis of the given data

Answer:

(a)

Core Books/NCERT

Explanation

Option (a) is correct: The biological children could have A or B blood groups but not O. The adopted son, therefore, is likely to have blood group O positive.