IT IS POSSIBLE TO HAVE 2 SETS OF DNA
It is known as Chimerism. One way Chimeras can happen naturally in humans is if a fetus absorbs its twin. If one embryo dies very early in pregnancy and some of its cells are “absorbed” by the other twin the remaining fetus will have two sets of cells: its own original set, plus the one from its twin.
In one of the most well-known cases Lydia Fairchild, nearly lost custody of her children when DNA testing “proved” she wasn’t related to them. Fortunately, doctors eventually determined that she had a second set of DNA that matched and the case was cleared.
In recent studies Scientists have grown an embryo that is part-pig, part-human. The study involves injecting human stem cells into the embryo of a pig. After four weeks, the stem cells had developed into the precursors of various tissue types, including heart, liver and a small fraction of the developing pig was made up of human cells. The hope is that one day doctors will be able to grow human tissue using chimera embryos in farm animals, making organs available for sick humans who might otherwise wait years for a transplant.
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