SPECIES AND SPECIES CONCEPT|HINDI EXPLAINATION |

CONTENT

INTRODUCTION
CONCEPT OF SPECIES
TYPOLOGICAL
NOMANLASTIC
BIOLOGICAL
EVOLUTIONARY SPECIES CONCEPT IN DETAILS




Species are groups of actually or potentially interbreeding populations which are reproductively isolated from other such groups[13].
The biological species concept has been prevalent in the evolutionary literature for the last several decades and is emphasized in many college-level biology courses. It is probably the species concept most familiar to biologists in diverse fields, such as conservation biology, forestry, fisheries, and wildlife management. Species defined by the biological species concept have also been championed as units of conservation[17].
Theodosius Dobzhansky, a prominent evolutionary geneticist and an important contributor to the modern evolutionary synthesis, characterized the concept of a biological species as a system of populations[7,8]. The gene exchange between these systems (species) is limited or prevented by reproductive isolating mechanisms, such as species-specific breeding behaviors, hybrid sterility, and gametic incompatibility. Thus, under the biological species concept, species are simultaneously a reproductive community, a gene pool, and a genetic system. The study of reproductive isolating mechanisms is central to the biological species concept because these mechanisms provide barriers to gene flow that define the boundaries of the reproductive community and gene pool, and preserve the integrity of the genetic system of the species. In practice, however, isolating mechanisms are rarely studied and species are usually diagnosed by differences in phenotypic (morphological) features.




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