I understand DNA companies like 23andMe and Ancestry are able to tell you your ancestry based on many samples from people with known genealogy, but how do they trace it back further? For example, this [article](https://www.greatfallstribune.com/story/news/2019/05/06/blackfeet-man-dna-deemed-oldest-americas-cri-genetics/3145410002/) says this man’s DNA has been traced back several thousands of years to Arizona. How?
In: Biology
Answer: It is possible to analyze DNA from well preserved remains. [Emory University has an entire laboratory dedicated to anthropological DNA research.](https://www.lindoancientdna.com/)
By analyzing thousands of samples from hundreds of archeological sites, it’s possible to create crude maps and timelines of the spread of specific genes.
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