Can a o positive mum have an a negative child?

Only if she took RhoGAM to turn off her body's immune system trying to defend against some "foreign body" (the baby. ) You'd know that, as you'd be the one getting the shot.

Yes. Positive is a dominant trait. She could easily have one + and one - gene.

If she does, she could pass on the negative gene, and if the father has at least one negative gene, and he passes it on, the child will be negative.

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