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→General Requirements
1) There must be a set of individuals.
1) There must be a set of individuals.
2) These individuals must reproduce somehow.
2) These individuals must reproduce somehow.
3) The probability or rate of reproduction must be somehow dependent on a trait of the individual which its offspring also have (or at least have with greater probability than the general population).
3) The probability or rate of reproduction must be somehow dependent on a heritable trait of the individual (where a heritable trait is one that is more likely to be present in an individual's offspring than it is in the general population).
In any such system, individuals whose traits allow them to reproduce more effectively will soon come to dominate the population.
In any such system, individuals whose traits allow them to reproduce more effectively will soon come to dominate the population.
== Variation and Randomness ==
== Variation and Randomness ==