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Unformatted text preview: in populations. Documentation of this abounds in the field of ecology where studies of competition are common. Although natural selection acts on phenotypes, recall that the phenotype is the expression of the genotype, and it is the specific alleles that are passed on to the next generation. Natural selection does not cause genetic changes within an individual. An individual cannot evolve. Natural selection acts on the individual. The population evolves as a consequence of differential reproduction. Moreover, evolutionary change is not, in and of itself, something that is good or more valuable (or bad). Evolutionary change occurs because a specific environmental condition favors one genetic combination over another. If the environment changes, the genetic combination favored may also change....
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- Spring '10