It is impossible for a type of O+ baby to have a type of____________mother:
- A. AB-
- B. O-
- C. O+
- D. none
Explanation
An O blood-group child must inherit an O allele from each parent, but an AB mother has only A and B alleles. The mother's Rh-negative status does not prevent an Rh-positive child, so AB- is the impossible option.