Genetics can be defined as the genetic makeup of an individual or species. A gene expresses a trait that the organism will have; a gene has multiple expressions.
Purebred is offspring that result from the mating of a similar parent. The idea of purebred has fundamental characteristics that are consistent, replicable, predictable. Pure breeding is of necessity carried out from a restricted gene pool, which has been a cause of concern.
Hybrids are offspring that result from the mating between two genetically parents. There are various kinds of hybrids, which include interbreeding of two species, intraspecific hybrid, intergenic hybrid, interfamilial hybrids. Another type of hybrid is a selective hybrid, which helps to enhance a consistent, desirable characteristic.