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When a set of fraternal twins have offspring, it is possible for one or more of these children to contain both sets of the fraternal twins separate DNA. Testing may show one set or the other, which would create a false reading, though true. This is the result of a genetic mutation during incubation, while the twins are invitro, but because they have different DNA their genomes can merge or mix, resulting in a genetic "chimera." This is rare, but possible.

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15y ago

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