Don’t get me wrong. Autosomal DNA testing is a very valuable tool. A match has the possibility of breaking through some very significant genealogical brick walls. It’s important to understand what a match means or doesn’t mean.
In a nutshell, we all have 46 chromosomes, 23 from mom and 23 from dad. Two of those chromosomes are the sexy kind, X and Y. We’ll ignore those for now. In an autosomal test, the DNA sequences in your chromosomes are compared against everyone in the testing company’s database. The goal is to find long matching sequences. Depending on how long the sequences are and the total number of matching sequences, a calculation predicts the cousin relationship.
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