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'''Speciation''' one suggested process by which new species are thought to arise, possibly by [[Darwin-Wallace evolution]].  It occurs due to [[natural selection]] and separation of populations of the same species, allowing allele frequencies in the two groups to change independently.  See [[evolution]] for a detailed dissection of the many problems of this theory.

'''Speciation''' one process by which new species are thought to arise, possibly by [[Darwin-Wallace evolution]].  It occurs due to [[natural selection]] and separation of populations of the same species, allowing allele frequencies in the two groups to change independently.  See [[evolution]] for a detailed dissection of the many problems of this theory.

==Species==

==Species==

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"A group of [[organisms]], with similar morphological, physiological, biochemical and behavioural features, which can interbreed to produce fertile offspring, and are reproductively isolated from other species." - Jones M. & Gregory J., Biology 2, 2001, Cambridge University Press, ISBN 0-521-79714-4<ref>Biology 2, Jones M. & Gregory J., 2001, Cambridge University Press, ISBN 0-521-79714-4</ref>

"a group of [[organisms]], with similar morphological, physiological, biochemical and behavioural features, which can interbreed to produce fertile offspring, and are reproductively isolated from other species." - Jones M. & Gregory J., Biology 2, 2001, Cambridge University Press, ISBN 0-521-79714-4<ref>Biology 2, Jones M. & Gregory J., 2001, Cambridge University Press, ISBN 0-521-79714-4</ref>

</blockquote>

</blockquote>

==Parapatric Speciation==

==Parapatric Speciation==

==References==

==References==