Both of my parents have rhD positive blood. I came out with rhD negative blood. How?

Question

Mum: O+
Dad: B+
Me: O-

In: 673

Answer 1

From my basic of basic understanding of genetics. Your Dad and moms DNA are made up of your grand parents and maybe they had a trait for O-. Or maybe your test has a mistake, which happens rarely. Or maybe there is more to the story. In the most likely case you may just be lucky and we’re given some distant trait.