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It simply means that mutations happen and do not, in and of themselves drive evolution. Mutations do not necessarily need to be advantageous or deleterious, they just happen and exist within the population at some low background. However when you combine mutation with environment and Natural Selection, then certain characteristics are favored while others ...


(I give an explanation to the statements, please understand that almost all evolutionary changes are mutational in the basis). Let's say the greater height is advantageous in one area, while in other area the smaller height is advantageous. In the former area, the direction of phenotypic changes will be to the individual with higher height, while in the ...

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