When Parents with b positive and o blood have baby negative group?

When a parent with B positive blood type and a parent with O negative blood type have a child, it is possible for the child to have B negative blood type. This can happen because the B positive parent can pass on either a B or an O allele to the child, while the O negative parent can only pass on an O allele. If the B positive parent passes on an O allele and the O negative parent passes on an O allele, the child will have B negative blood type.

B positive blood type is represented by the genotype BB or BO, while O negative blood type is represented by the genotype OO. When a BB parent mates with an OO parent, the possible offspring genotypes are BO (B positive) and OO (O negative). Therefore, there is a 50% chance that the child of B positive and O negative parents will have B negative blood type.