In Greek mythology, a chimera is a female creature made up of three different animals. In reality, chimerism is no where near as mystical; it is simply characterized by one organism made up of at least two different genotypes - or two separate sets of genes. Animals can be chimeras, like an anglerfish during procreation. Or, like a cat with a perfectly halved face.
But can people be chimeras? Yes, but it is sometimes not as obvious as it is with the rest of the animal kingdom. Humans classified as chimeras have two different sets of DNA or blood types. Genetically, a chimera is exemplified as a person who was meant to be born in a set of twins but absorbed the other fetus in the womb. Individuals who are chimeras can suffer devastating effects legally and physically due to their mixed genetic makeup.