Handwritten Apple Goodnotes Grade 12 IEB study document for Origins and Evolution. Designed with clear explanations, diagrams, and concise summaries, these notes cover most key topics in alignment with the IEB Life Sciences syllabus. Through use of step-by-step approaches and detailed problem-solvi...
, · Not hypothesis ,
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
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