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Can parents both o positive have a child with o negative?

  • Yes, they can. The Rh negative factor is a recessive trait and the positive is a dominant trait. Parents who are Rh positive can have two possible phenotypes +- or ++. If both parents are +- then they may have children who are ++, +- and --. The -- will obviously be Rh negative. I am proof of this. Both my parents are Rh positive and I am Rh negative. Also two O type parents can only have a O child since the O trait is recessive and they will only carry the gene for O blood.

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