Multiple choice

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

  1. O positive

  2. A positive

  3. B positive

  4. Cannot be determined on the basis of the given data.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

AB positive partner forms two type of gametes; A positive and B positive.  O negative partner forms only single type of gamete O negative.  Two type of zygote formation occur A+O- (A positive) and B+O- (B positive). The blood group of the adopted son will be O positive. 

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