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Within species we recognize landraces: within a landrace animals resemble each other but among individuals you still may observe diversity in a lot of phenotypic traits. Out of the landraces mankind created standardized breeds (and later on, out of these, special selection lines). In the standardized breeds animals resemble each other more than in landraces. They are more uniform; but still among individuals of standardized breeds diversity can be observed. To conclude: within animal populations (species or landraces or breeds or selection lines) diversity exists that has a genetic origin. The origin is determined by the fact that animals differ in their DNA composition: within a species more than in a landrace, within a landrace more than in a standardized breed and within a standardized breed more than in a selection line. A broad definition of genetic diversity is:
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DefinitionGenetic diversity is the set of differences between species, breeds within species, and individuals within breeds expressed as a consequence of differences in their DNA |
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