11. We can have more than one set of DNA – Known as chimerism, this condition can arise when two eggs are fertilised inside the mother. Instead of developing independently to produce non-identical twins, one absorbs the other, taking on its cells and DNA. The outcome is one individual combining cells with two different genotypes. Most chimeras are oblivious to their genetic makeup, but it can create some strange results. Indeed, they may have two blood types or even organs with different genotypes.
