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4.1.2 OUTLINE THE MECHANISM
OF NATURAL SELECTION AS A
POSSIBLE DRIVING FORCE FOR
SPECIATION
: the process where individuals best suited to their
environment survive and go on to reproduce so successful
genes are passed on to the next generation.
: a process by which new species are formed by successful
genes being passed on to the next generation, changing the
gene pool and ultimately leading to a new species.
: a group of organisms that can interbreed and produce
fertile offspring.
: the development of new species over very long periods of
geological time.
Evolution
Natural selection
Speciation
A species
The theory of evolution was suggested by …
He noted that:
All species tend to …
–produce.
This means there is …
for resources and a
struggle for …
.
Species show …
, and so he concluded that
those best adapted to their environment …
and these can then go on to
.
Successful genes are therefore …
This is called natural selection.
Over time changes in the species’ gene pool leads to …
Artificial selection is selective breeding – this is when humans
choose animals to breed together because of their…
Darwin’s theory is often called ‘survival of the fittest’.
Why?
Finches adapted to their individual island environments
by …
Tortoises with long necks were more successful because….
This meant that on some Galapagos Islands tortoise shells
Lizards that learnt to swim were more successful because
Species and Speciation
• Interbreed and
produce fertile
offspring
• New species
produced
(cc) Image from Flickr by Andion
4.1.2 OUTLINE THE MECHANISM
OF NATURAL SELECTION AS A
POSSIBLE DRIVING FORCE FOR
SPECIATION