How is it possible that my daughter is blood type O negative if I

The relationship between blood group of parents and children

ABO blood group system, Definition, Blood Type, & ABO Antigens

If a mother has O positive blood and the father has B positive blood, what blood type will their daughter be? - Quora

Both of my parents have O+ blood type. My brother is O+, but I'm B+. My parents told me it's because my grandfather on my dad's side is B+, and her mom

Blood Types in Pregnancy Children's Hospital of Philadelphia

blood type problems - Name: 1. Could a man with type B blood and a woman with type AB produce a child with type O blood? A. Possible B. Not possible

Why is my daughter in the O-positive blood group, while I'm an A-positive and my husband is B-positive? - Quora

My cousin's blood group is B positive. His mother's blood type is A positive and his father is O positive. Is this possible? - Quora

Both of my parents are blood type O, my mom being O positive and my dad O negative. Why am I A+ ? Should I do a DNA test? - Quora

If the father is O negative, and the mother is A positive, can the child be A negative? - Quora

Everything (and then some) about blood types