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Originally Posted by Kullat Nunu
Mutation is practically a random process. It absolutely doesn't "know" anything. Vast majority of mutations are irrelevant or even harmful (like genetic diseases for example), but a very few actually increase the fitness of an individual. Such individuals succeed better at reproduction (more of them stay alive long enough to get offspring, or they're more sexually attractive etc.) and the relatively number of offspring carrying that mutation increase in the population.
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Interesting to speculate which genes will be prominent in, say, a thousands years. With the current trend of everyone trying to act and talk "cool" I would guess the future genes may have that bit of easy-going, laid back feature. Also its interesting to note that looks are becoming less and less important, especially in males and what partners look for is more the attitude than merely looking handsome.
The "smart" genes will probably decrease as its common that most geeks/nerds find it harder to find suitable mates (unless they have those high-paying jobs
) and also due to the fact that smart couples usually have less children.