Can two o positive parents have an o negatve baby?

Similar questions: positive parents negatve baby.

Since O is recessive (not a dominant gene), both parents could only give an "O" gene to the baby, so the baby would have to be type O. However, with the rh factor (+ or -), the positive is dominant, so both parents can also have the - gene, it's just not expressed. If both parents have the - gene but are O +, they have roughly a 25% chance of having a baby that is O negative.

Alissa, RN .

Thank you Alissa, I,m 50 and when I had my first child the man who took my blood test told me my parents could not have had a o- baby, my blood type- Thank you suxie6 7 months ago .

Yup, he was wrong, but there's been a lot more research about genetics in the last 50 years so maybe that was the thought then. Have a great day! Alissa .

Yes, as the Plus gene is dominant, so the parents could both be +- genotype, which shows up as a + phenotype in both. So their child has a 25% chance of getting the - gene from them, and end up -- genotype, - phenotype.

Well both my parents are o+ and I think i'm o+ so its less likely but yes it can happen .

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