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

Dominant and recessive genes.

For example, the gene for Brown eyes is dominant, the gene for blue eyes is recessive. So if I get the brown-eye gene from one parent and the blue-eye gene from the other, I’m going to have brown eyes, because the brown-eye gene is dominant and ‘wins’ over the blue-eye gene.

But, I still have the blue-eye gene that I can pass along to my children. So let’s say my wife also has both the blue-eye and brown-eye gene. She’ll also have brown eyes because, again, the brown-eye gene is dominant… but if our child gets the blue-eye gene from me *and* gets the blue eye gene from my partner, they’d have blue eyes despite the fact neither me or my wife has blue eyes.

Basically, both your parents have the rhD- gene which is recessive, they both passed that on to you