There is actually a case of a persons sex organs being of different genetics than the rest of her body. Her name was Lydia Fairchild and there was a whole interesting court cased involved for those who are interested.
By mixing I was more referring to phenotypical expression, for example a split faced cat or an animal that appears to be a ball with blood genitalia. Often a hybrid takes cues from one parent over the other. As we see in snakes you can actually get offspring that resemble each parent, which is why I went with the chimera theory. Thinking about this more though, you would not even need chimerism for this to happen as it simply could be a case of which phenotype is shown. A hybrid is not always a perfect mix of both animals but may take traits from either. Also we are assuming that snake hybrids are diploid when the fact that they are not generally sterile could point to polyploidy even further making this a possible situation. If this were the case then the possibility that a chimera that is genetically separate part ball and part blood actually do exist, although I will admit the probability is incredibly low.









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