A child and his/her mother both has blood group ‘O’. What can be the possibilities of blood group of father of child ?  (A) ‘A’  (B) ‘B’  (C) ‘O’   (D) All of these
A child and his/her mother both has blood group ‘O’. What can be the possibilities of blood group of father of child ?  (A) ‘A’  (B) ‘B’  (C) ‘O’   (D) All of these

 Answer: (D) All of these

Explanation: Blood type is not a very good test for paternity, as this discussion has demonstrated. Unambiguous information can be obtained in some cases, such as the fact that a type AB male cannot father a type O child. However, in the vast majority of situations, the outcomes are inconclusive.