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-final point, driving force for evolution is natural selection • Descent with modification
population=group of organism within the same species • Outcome is an organism matched
(adapted) to its environment
• Matching optimizes reproductive
success (fitness) Charles Darwin
(1809-1882) Alfred Russel
(1823-1913) • Evolution does not optimize
lifespan or general health
• Driving force is natural selection Mechanisms of Evolution darwin observe the first 3:
2. variation exist in a population
3. heritable (this variation can be pass on to the successive generation/offspring). there are 3
source of this heritable/genetic variation: 1. mutation 2. recombination (exchange of genetic
material between homologous chromosome during meiosis) 3. epigenetic modification of
genome (that do not involve in changes in nucleotide sequence) 4. more recently, during
embryonic development, the environment can modify the phenotype, this selection can act on
this phenotypic variation (this is call developmental plasticity). this is particularly important in
development of nervou...
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- Spring '09