Answer:
2 AB and 2BB
Explanation:
If a person type B blood group have children with AB blood type. There are 2 cases:
1- if BO cross with AB then children will be of AB, BB, AO, and BO.
2- if BB costs with AB then children will be of AB, BB, AB, and BB.
O is a recessive allele it only express when in OO form than a person has O blood group.