Originally Posted by equiniphile
Pretty sure it has to do with the chimera gene
Chimera isn't a gene sweetie. It's a term used to describe an animal that is the result of twins that meld together to form one animal in the womb.
Incidently, there has been a case of a human chimera. It was a woman who needed a transplant of some kind, so they tested her three adult sons to see if they were compatable. Not only was the youngest one not compatable, he was also not genetically her son. She had absorbed a twin in her mother's womb, and one of her ovaries belonged to said twin.