Question

Can a father with AB- blood type and a mother with an O- blood type have a child with O- type?

Answer 1

yes the child can have O- blood group.

Answer 2

Each biological parent donates one of their two ABO alleles to their child. A mother who is blood type O can only pass an O allele to her son or daughter. A father who is blood type AB could pass either an A or a B allele to his son or daughter.