CB4b - Darwin’s theory
- Created by: anniemazzzzz
- Created on: 03-04-18 19:01
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- CB4b -
Darwin’s theory
- genetic variation (aka inherited variation) - differences between organisms caused by differences in the alleles they inherit from their parents, or differences in genes caused by mutation
- natural
selection - a
process in
which certain
organisms are
more likely to
survive and
reproduce
than other
members of the
same species
because
they possess
certain genetic
variation
- adaptations allow organisms to survive
- 'survival of the fittest'
- natural
selection allows
some members
of a species to survive better
than others
when conditions
change
- those members of the species gained features (adaptations) which helped them to survive
- the
development
of resistance
in organisms
supports
Darwin’s theory
- due to genetic
variation, there
will always
be certain
individuals
in a species,
resistant to
different things
- if there is a
product that
can kill a
species, not all
individuals will
die because
some will be
resistant to
the product
- this resistance will lead to the resistant individuals surviving and breeding with other resistant individuals leading to more resistant individuals
- if there is a
product that
can kill a
species, not all
individuals will
die because
some will be
resistant to
the product
- due to genetic
variation, there
will always
be certain
individuals
in a species,
resistant to
different things
- natural
selection can
lead to the
evolution of a
new species
- 2 animals can
evolve from the
same animal
(they share
a common
ancestor)
- conditions
changed for
the ancestor
- due to genetic
variation, some
animals will
adapt better to
the difference
- the ones that
adapted were
more likely to
survive that
the others that
didn't/couldn't
- more of these individuals survived and bred forming a new species over time
- the ones that
adapted were
more likely to
survive that
the others that
didn't/couldn't
- due to genetic
variation, some
animals will
adapt better to
the difference
- conditions
changed for
the ancestor
- 2 animals can
evolve from the
same animal
(they share
a common
ancestor)
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