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Fewer SNPs Test Reveals Familial Relationships Up to Second Cousins

drawn image of a double helix of DNA

Fewer SNPs Tested Means Faster and Cheaper Results A new DNA analysis methodology — based on a quick swab test using fewer SNPs– allows high-certainty detection of 2nd cousins or closer. In order to determine if two people are related (they call second cousins distant relatives although we genealogists would consider them close relatives!) the research team used an index of relatedness: “index of chromosome sharing” (ICS). ICS compares the total cM two people share to a chart detailing the likely relationship between them. The chart is adjusted for the number of SNPs tested. In their prototype testing, they used … more…