Genotypes and Phenotypes

 Natural selection is based entirely on the external environment of the organism and the more favorable and compatible an organism is with its environment the more natural selection would favor said organism. It does not matter to natural selection if the phenotype is a random mutation or not as long as the phenotype is favored by its environment and is a heritable trait, that certain phenotype will become more and more common in each passing generation until it is the dominant phenotype in the population. This domination is the bases to evolutionary change.

a little more simplified explanation:


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