Species, concept of pure and impure breeds.

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SUMMARY

The discussion clarifies that the terms "species" and "breed" are distinct, with species defined as a group of organisms capable of interbreeding, while breeds are specific varieties within a species, such as German Shepherds and Pitbulls, which are both breeds of the same species, Canis lupus familiaris. The concept of "pure" and "impure" breeds relates to the inherited characteristics and lineage of these breeds. The definition of species can be refined to emphasize that it includes organisms that not only can interbreed but commonly do so, as illustrated by the example of lions and tigers.

PREREQUISITES
  • Understanding of biological taxonomy
  • Knowledge of genetics and heredity
  • Familiarity with the concept of interbreeding
  • Basic comprehension of animal breeding practices
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  • Research the genetic implications of interbreeding among different breeds
  • Explore the concept of pedigree and its importance in animal breeding
  • Study the biological species concept in detail
  • Investigate the differences between hybrid species and pure breeds
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Biologists, geneticists, animal breeders, and anyone interested in understanding the distinctions between species and breeds in the context of animal classification and breeding practices.

Prashasti
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The definition of species is "a group of organisms that can interbreed with each other". So, how is interbreeding of two dogs of different species, say a german shepherd and a pitbull, possible? And the concept of a "pure" and "impure" breed - how will you explain it? As according to the definition, a GSD cannot be crossed with a pitbull?!
 
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A breed is not the same thing as a species.

German Shepherd and Pitbull are not different species, they are different breeds of the same species. The concept of pure and impure breeds refers to inherited characteristics of the breed and lineage (pedigree).

A breed is a stock of animals or plants within a species having a distinctive appearance and typically having been developed by deliberate selection.

More on species:
http://evolution.berkeley.edu/evosite/evo101/VA1BioSpeciesConcept.shtml
 
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Also, your definition lacks precision. It could be improved thus:

A species is a group of organisms that can interbreed with each other and commonly do so.

Lions and tigers can interbreed yet are members of separate species, yet interbreeding is rare.
 

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