2-Evol Perspectives Figs BW

final point driving force for evolution is natural

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Unformatted text preview: ual. -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 Wallace (1823-1913) • Evolution does not optimize lifespan or general health • Driving force is natural selection Mechanisms of Evolution darwin observe the first 3: 1. ... 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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