A closer look
Chimerism occurs when a pregnant woman conceives fraternal twins but one embryo dies early and is completely absorbed by the surviving fetus. The surviving baby is born with two entirely different sets of genetic code, often resulting in blood cells or organs that belong to their deceased sibling. This means you could theoretically fail a maternity test for your own biological child because your ovaries are operating under the genetic identity of the twin you unknowingly cannibalized in the womb. It is the ultimate form of sibling rivalry where you win before you are even born by literally absorbing your competition to become a localized genetic frankenstein. Medical science only discovers these cases by accident, leaving us to wonder how many walking genetic mashups are currently arguing with people on the internet, completely unaware they are biologically piloting a stolen flesh mecha
