BIOL479 Lecture Notes - Lecture 6: Pearson Education, Fecundity Selection, Mechanical Equilibrium

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Differences in the survival and reproduction of phenotypes, leading to differences in their contribution to the next generation, resulting in a change in the freq. of heritable phenotypic variations in populations over time. Fitness" refers to an individuals contribution to the next generation, in terms of #s of offspring. Ability to survive and reach reproductive age. A trait or characteristic that increases an individuals fitness (compared to individuals that do not possess the trait) Darwin"s theory of natural selection & four postulates: individuals within species are variable, some of these variations are heritable, in every generation, more offspring are produced than survive, the survival and reproduction of individuals is not random. Those some are more successful at survival and reproduction that others who reproduce, or reproduce the most are those with the most favourable variations and are naturally selected. Those who survive and contribute the most to the next generation are the most fit.

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