A baby's blood group was determined as O negative. Which of the following blood group the baby's mother or father will not have?: (A) A Positive, (B) B Positive, (C) AB Negative, (D) O positive
Answer is C. Baby's mother or father will not have AB blood gp. Because if either of them will have AB then progeny can not have O blood group. AB * AO - AA, AO,AB,BO (no O gp possible) AB *AA -AA,AA,AB,AB (no O gp possible)