Look at the chart below to see what blood type the children of two parents can have, and which ones they cannot. This chart applies to the ABO blood type system.
* Under special circumstances, another blood type may be possible.
The following is true for the Rhesus D factor. If both parents are negative, the child is also RhD negative. If one or both parents are RhD positive, the child may be both positive and negative.
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