WBCS.LIVE practice question

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

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. O positive
  2. A positive
  3. B positive
  4. Cannot be determined on the basis of the given data.

Correct answer and explanation

Correct answer: O positive