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Speciation
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Which scientist nearly published his findings on speciation before Charles Darwin?
Alfred
Russel
Wallace
What is a species?
A species is a
group
of
organisms
that are
able
to
interbreed
and
produce
fertile
offspring.
One of the
main
ways new
species
arise is when
populations
become
isolated
from each
other.
Charles
Darwin
and Alfred
Russel
Wallace, both
proposed
the
theory
of
evolution
by natural
selection.
Explain how two different species of rabbit could have developed from a common ancestor.
Two
populations
became
separated
/
isolation
(by a
geographical
barrier
like a
river
or
mountain
)
These
populations
had different
gene
pools
/ developed different
mutations
Each population was
exposed
to
different
environmental
conditions
(e.g.
weather
,
water
levels
etc)
Natural selection
occurs in the
two
populations
which
favours
the
alleles
that
best
suit
each
environment
So the
two
populations become
genetically
different
Eventually they cannot interbreed to produce
fertile
offspring
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