Sibaron t1_ja0h8tr wrote
Reply to comment by goose966 in How do scientists know where the mutation in a gene originated and how long ago the mutation occured? by goose966
The appearance of new genes can be tracked by sequencing of populations and the appearance of the gene in the population. It involves looking at the specific genes and homology to other conserved genes in a population. Often it also involves tracing migration and behavior of humans in the past. Then you often see a correlation with human migration and settlement in a environment where such a mutation is beneficial.
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