Chimera

(or chimaera) 1. An organism whose cells are not all genotypically identical. This can occur as a result of: somatic mutation; grafting (see: graft chimera ); or because the individual is derived from two or more embryos or zygotes. 2. A recombinant DNA molecule that contains sequences from different organisms.

An organism composed of cells derived from at least two genetically different zygotes. Theoretically, the zygote could be from separate species.