extensive and repeated observations experiments
to support it
. No new information disapproves of it
.
key role players in
developing the Theory of Evolution
Dr Erasmus Darwin. Jean Baptiste Lamarck
Species change overtime , Provided mechanism for
species change :
no reason provided Species acquired trait
through the use disuse of a body part to fultil a
Age of earth is older than need niche .
Threater trait becomes hereditary
believed thousands. Theory is incorrect , no correlation to
genes.
⑧
1780 1800 1900
Charles Darwin
HMS beagle
Differences w/
5 year around the south to collect data about species.
,
voyage specieslivinis
but different arca
Discoveries : Diversity and fossil
of species, variation w/in a species , illogical distribution of species records to
account for extinction of
species .
With the help of Alfred Russel Wallee
* Darwin's
Origin of species book
·
Theory of natural selection
1 .
Variation .
2 Environmenta change pressure .
3 Environment conditions favours certain individuals. Favour
individuals will thrive compared to others, have better reproductive success .
3 Favoured genes are passed on
·
Descent with modification
All related descended from Ancestral divide and adapt to loca
organisms a common ancestor .
species new
conditions .
They become modified and diversity into new species usually over millions of years
Scientific Theory
Biological evolution
Change in the
gene pool of a
population over time due to processes such as mutation , natural selection and
genetic dritt.
Modification by descent
·
Lines of evolution evidence
Genetics Strong
1.
All Genes how
organisms have
show descended from
·
DNA and RNA mRNA . can species a common ancestor an
how closely related to each other they are
Fossils of extinct species
show change over time
2.
Fossil Records
strong
Increase fossils complex fossils rocks
·
in complexity w time , simplest oldest rocks , more newer
Increase in diversity over time
Descent with modification , modern species fossils can be traced back showing changes that occurred.
Transitional fossils , have given and elephant
suggest to the wolly mammoth
·
one
group may rise other .
↑
Chemical evidence carbon be used to date fossils
dating can
can be used
ing