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Hybridisation or hybridization التهجين: The process of combining different varieties of organisms to create a hybrid. Hybrid الهَجين: (molecular biology) A complex formed by joining two complementary strands of nucleic acids. In biology, hybrid has two meanings: 1- crosses between populations, breeds or cultivars within a single species. This meaning is often used in plant and animal breeding, where hybrids are commonly produced and selected because they have desirable characteristics not found or inconsistently present in the parent individuals or populations. This flow of genetic material between populations or races is often called hybridization. 2- Offspring resulting from the interbreeding between two animals or plants of different species. Intra-specific hybrids: between different subspecies within a species (such as between the Bengal tiger and Siberian tiger) Inter-specific hybrids or crosses Hybrids between different species within the same genus (such as between lions and tigers) . Inter-generic hybrids: Hybrids between different genera (such as between sheep and goats) . Extremely rare inter-familial hybrids have been known to occur (such as the guineafowl hybrids). No inter-ordinal (between different orders) animal hybrids are known. http://en.wikipedia.org/wiki/Hybrid_%28biology%29