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Concept Of Species - School Essays

Concept Of Species

Over the last few decades the Biological Species Concept (BSC) has become
predominately the dominant species definition used. This concept defines a
species as a reproductive community.
This though has had much refinement through the years. The earliest
precursor to the concept is in Du Rietz (1930), then later Dobzhansky
added to this definition in 1937.But even after this the definition was
highly restrictive. The definition of a species that is accepted as the
Biological species concept was founded by Ernst Mayr (1942);

“..groups of actually or potentially interbreeding natural populations
which are reproductively isolated from other such groups”

However, this is a definition on ...

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is
the predominate form of reproduction in these groups. It is not
coincidental that the BSC is less widely used amongst botanists.
Terrestrial plants exhibit much more greater diversity in their mode of
reproduction than vertebrates and insects.
There has been many criticisms of the BSC in its theoretical validity and
practical utility. For example, the application of the BSC to a number of
groups is problematic because of interspecific hybridisation between
clearly delimited species.(Skelton).
It cant be applied to species that reproduce asexually ( e.g Bdelloid
rotifers,eugelenoid flagellates ).Asexual forms of normally sexual
organisms are also known. Prokaryotes are also left out by the concept
because sexuality as defined in the eukaryotes is unknown.
The Biological species concept is also questionable in those land plants
that primarily self-pollinate.(Cronquist 1988).
Practically the BSC has its limitations in the most obvious form of
fossils.-It cant be applied ...

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Concept Of Species. (2007, September 17). Retrieved December 25, 2024, from http://www.essayworld.com/essays/Concept-Of-Species/71313

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PAPER DETAILS

Added: 9/17/2007 03:23:45 PM
Category: Science & Nature
Type: Premium Paper
Words: 1248
Pages: 5

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