Yeah Kristy.. I learned about Chimeras too! Isen't it fascinating?
People and animals who have different colored eyes are Chimeras.
A Chimera, basically, is when early on in a twin pregnancy (before it is known usually) one embryo passes, and is absorbed into the other fetus.. thus some parts of a persons body can be made from the dna of their lost sibling, and most never know!
A woman got very ill, and needed an organ transplant... she had three grown sons, so they tested them all... and only one son came back as being hers biologically! Turns out, she was a chimera, and one of her ovaries had her genetic eggs, and the other was her sisters! So that twin had children without ever being born!
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Not always. Bicolored eyes are often a result of heterochromia. Chimeras are incredibly uncommon. Heterochromia is not, if it's genetic, it's an autosomal dominant, so it's pretty easy to pass on.
Eye crap I know too much on having heterochromia and color blindness. Fun.
I was going off the program I saw... they were saying that since the chimera thing happens so often before even 4 weeks of development.. they speculate it happens far, far more frequently than anyone knows. Kinda hard to have all your organs dna tested, right?