Chimeras are also exceptionally rare and incredibly difficult to correctly identify without testing. Things like heterochromia are commonly called an indicator of chimerism, but it isn't nearly so simple nor is it a definitive sign.Originally Posted by Albert Clark
More on the "chimera" phenomenon. An animal chimera is a single organism that is comprised of two or more different populations of genetically distinct cells that originated from different zygotes involved in sexual reproduction. Animal chimeras are produced by the merger of multiple fertilized eggs. Also can present with different eye color and differing hair growths on opposite sides of the body.
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