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It is as Goshin says, evolution requires random chance in order to go to the next step of natural selection. The fact that these genes already existed though proves that nothing has been "evolved" or altered genetically. It's as simply as this. Those who already had the genes that better suited them to live at high altitude were the ones that survived and passed on that gene to their kids. Those without those genes either died or moved back to lower altitudes. This is a case of natural selection, not evolution. Regardless, the 3,000 years would be insufficient time according to evolutionary scales for these 30 genes to change into something beneficial through random mutations.
The genes themselves were not "altered" in this example, but rather gene groups .