Answer:
2. 50 percent
Explanation:
in the ABO system, similar inheritance patterns are seen in all blood group systems.
If a person of O blood group breeds with a person of B group all the children must be either B or O.
In the example given, there are 2 phenotypes of Type O blood and Type B blood. The type O blood phenotype can only result from one genotype of OO. But Type B blood can result from two different genotypes of BB and BO