re: What percent Native American are you? Which tribe?

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To determine your ancestral breakdown, we use an algorithm that individually looks at short pieces of DNA across your genome. We compare each piece to DNA sequences from 31 ancestral reference populations from around the world, which include over 10,000 individuals with known ancestry. When a piece of your DNA resembles the DNA from a specific reference population with a high degree of certainty, it is assigned to that population. Sometimes a piece of DNA resembles reference DNA from several populations, in which case it is assigned to a "broad" ancestry (e.g. Northwestern European). The results of these assignments are tallied across your genome to determine your results.

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To determine your recent ancestor locations, we look for identical pieces of DNA that you have in common with individuals of known ancestry from over 120 countries and territories in Europe, Africa, the Americas, Asia, and Oceania. If you share identical DNA segments with five or more individuals from a specific location (excluding your close relatives), that location is assigned to you. The strength of that assignment (the "match strength") is determined by how much of your DNA you share with people from that location, adjusting for the number of people that we compared you with. When interpreting your results, keep in mind the following:

- Country borders have changed a lot even within the past 100 years, which can sometimes produce counter-intuitive results.

- If you don't see an expected ancestry location, that doesn't necessarily mean that you don't have ancestors who lived there. It could simply mean that you do not have enough shared DNA with our reference dataset for us to confidently assign that location to you.

- We determine these results in real time, meaning that new locations can arise as our database grows and you should expect to see changes to your results over time.

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