Can blood group b plus give birth to ab plus?

A person with blood type B+ can potentially have a child with blood type AB+. This is because they have the B allele and the Rh+ allele, and their partner must have the A allele and the Rh+ allele in order for their child to have AB+ blood.

Here's a breakdown of the possible blood type combinations:

- If the B+ parent passes on the B allele and the Rh+ allele, and the other parent passes on the A allele and the Rh+ allele, the child will have AB+ blood.

- If the B+ parent passes on the B allele and the Rh- allele, and the other parent passes on the A allele and the Rh+ allele, the child will have AB- blood.

- If the B+ parent passes on the B allele and the Rh+ allele, and the other parent passes on the B allele and the Rh- allele, the child will have B+ blood.

- If the B+ parent passes on the B allele and the Rh- allele, and the other parent passes on the B allele and the Rh+ allele, the child will have B- blood.

Therefore, it is possible for a person with blood type B+ to have a child with blood type AB+.