Chimerism is a genetic condition in which one person carries two different sets of DNA. How often does this happen?
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Learned about it years ago from a CSI episode. Guy did a crime, the DNA sample didn’t match him, but was close enough to be a brother. After testing the brothers, none matched either. Eventually they learned the murder sample was from the absorbed twin. Chimerism is also what they check when you have a stem cell transplant (AKA bone marrow transplant) to see if your donor cells took over.
Chimerism describes technically two bodies who are combined into one. With plants you can do that in a quite simple manner: cut off a branch from tree A, cut one off of tree B, connect branch A with branch B and they will most likely continue to grow as one even though they have different DNA’s. Chimerism occur in humans too, but this happens in the womb, when the fetuses seemingly merge together at an early or sometimes even a bit later stage. Chimerism can only happen if you would have gotten twins but they merged into just one, then the one end up having double DNAs.