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In any species there
exist groups of
individuals called
demes…read more

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breed among themselves more
than witht the other individual
members of the population.…read more

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is the process by which an new
species with its own distinct gene
pool forms.…read more

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Isolating Mechanisms
are barriers to the passage of
genetic material between demes.
In the long term this can lead to
groups so different that they can be
called separate species.
A new species is unable to breed with
the old species+.…read more

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There are a number of
different isolating
mechanisms...…read more

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Geographic Isolation occurs when a
population is physically split into two or
more demes.
A physical barrier can be anything from a
river to a mountain and everything in
This kind of speciation is allopatric speciation,
it is very likely to occur.…read more

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Reproductive isolation occurs when there are
no physical barriers but two demes cannot
interbreed. This form of speciation is
sympatric speciation.
Numerous mechanisms can cause
reproductive isolation.…read more

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This occurs when
animals which have
Behavioral elaborate
isolation behaviours cannot
elicit the required
response in their
potential partner.…read more

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Mechanical Occurs where
mating pairs are
isolation. unable to couple
successfully.…read more



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