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

Determination of possible blood group type of a baby

What's the Rarest Blood Type in Humans?

Type O Blood: O+ and O- Blood Types - Bloodworks Northwest

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

What is “O RhD positive” blood? - Quora

Blood Type Predictor

How Does the Rh Factor Affect Pregnancies?

If a father is AB-, the mother is O+, and they have a child that is O+, is the child cis-AB or Bombay? - Quora

How is this? I am O, my daughter's father is A, and she is AB blood type. - Quora

My child doesn't look like me and he is O positive. I am O negative and the mother is A positive. What do I do? - Quora

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

Can the child be a positive if both parents are O positive? - Quora