You could star a match to remind yourself to research it later. If you’re wondering why you’d use a star, it’s simply to give you a visual cue for any reason that you choose. This is why you add the star through the custom group feature, which I describe in a later section. The yellow star icon became an extra group. Ancestry more recently provided a choice of 24 group colors to assign to matches. This used to be the only way to put a colored mark against a DNA match. So, I share 20 cM with this DNA match.Īncestry lets you mark a DNA match with a star icon by adding the match to the “Starred matches” group. We measure these pieces in “centimorgans” or cM. In the example below, there is a stretch of twenty adjacent pieces of DNA that are identical between the kits. Otherwise, the process jumps to the next marker to start checking again. Is there enough matching DNA to be related?Īncestry requires eight adjacent pieces of DNA to be identical. The shared DNA is due to chance, not through a common ancestor. If the next adjacent tiny piece is not identical, then this length of matching DNA is too small to be significant.
When the process hits position #71720971, it finds that a tiny piece of our DNA is identical between our results. The two kits are my own and a distant cousin. In our example, the matching process has worked across thousands of markers on Chromosome 12. Ancestry uses over 700,000 markers when comparing DNA results.
The DNA matching process looks at specific positions (or DNA markers) on each chromosome. Let’s work through a visual example ( that is very simplified!). When your DNA kit is processed, your results are checked against every other DNA kit in this database.Īncestry compares two DNA kits by counting how many tiny pieces of DNA are identical. More Articles and Tutorials How Does Ancestry DNA Matching Work?Įvery customer who takes an Ancestry DNA test has the option of being included in their DNA matching database.Using Your Ancestry DNA to Work With Matches on Other Sites.Tools and Techniques Missing from Ancestry.
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