They’re able to identify whether you’re close relatives (siblings, grandchildren, cousins, parents, etc.) or more distantly related (second cousins, great-aunts/uncles, common ancestors, etc.) by your genetic linkage.
The tests results are able to tell how closely linked your DNA is to the DNA of others, which means they can determine how closely you’re related to someone. So genetic testing services will run your DNA sample and cross-reference it against other samples to find any possible genetic links. In your DNA, you have chromosomal markers that can be identified and measured to determine possible genetic links between DNA samples. Whether you’re in the early stages of searching for birth parents in a closed adoption, or you’re simply trying to learn more about your roots, genetic testing for adopted adults can be a revealing look into the past. You may have some gaps in your adoption genealogy that you’ve always wondered about. As an adoptee, the family tree of adoption can be a little more complex than the family trees of others - especially if you were adopted before open and semi-open adoptions became the norm.
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