Why You Should Merge Your Factory DNA Kits: SNP Overlap Demystified In this blog, I want to briefly discuss why it is best practice to merge your factory kits from different testing companies prior to working with third party raw DNA tools such as Borland Genetics or GEDmatch. By factory kits, I simply mean raw DNA data files that were created directly by the testing companies by processing actual DNA samples. The first concept to understand is that different testing companies sample different sets of data points along your chromosomes. We refer to the totality of the data points sampled in a single DNA kit that kit’s “template.” Furthermore, individual testing companies have changed their chips over the years, also resulting in different kit templates. When you hear people talking about an Ancestry v1 or Ancestry v2 or 23 & Me v4 kit, they are referring to their tests by their template revision version. The ISOGG Wiki does...