The term crossbreed or crossbred refers to a hybrid animal of two purebred parents created by means of crossbreeding. Crossbreed may also refer to a domestic animal where the breed status of only one parent or grandparent is known. In biology, hybrid has three meanings. ... Purebreds, also called purebreeds or pedigreed, are cultivated varieties or cultivars of a species, achieved through the process of selective breeding. ... Crossbreeding is the process of creating hybrids (also known as crossbreeds, or a description of the lineage of that which has undergone hybridization. ...
See also Dog hybrids and crossbreeds A dog hybrid is a cross between two different breeds (selectively bred varieties). ...
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Because they do not crossbreed, it is safe to assume that there is a mechanism, often behavioral, that is preventing gene flow between the populations, and that therefore they should be classified as separate species.
For example, the Koalas of northern Australia are clearly smaller and lighter in colour than those of the south, but there is no particular dividing line: the further south an individual Koala is found, the larger and darker it is likely to be; Koalas in intermediate regions are intermediate in weight and colour.
The variation in Koalas is clinal (a smooth transition from north to south, with populations in any given small area having a uniform appearance), but the variation in magpies is not clinal.
John's Water Dog (no longer in existence), a crossbreed of native water dogs and the Newfoundland to which the Labrador is closely related.
The name Labrador was given to this dog by the Earl of Malmesbury and other breeders in England in order to differentiate them from the Newfoundland dog.
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