Y-Chromosome Single Nucleotide Polymorphism testing: Difference between revisions

DNA testing companies like FTDNA.com (Family Tree DNA) use the color green to represent a positive ( + ) or derived SNP test. Those estimated are in red and are not tested for that SNP.  Past testing of SNPs are also listed in green confirming the last positive ( + ) tested at that time. This means those who SNP tested many years ago is a lower resolution SNP test compared to today's SNP testing. The newer SNPs are confirmed as by the Big Y test chip as at FTDNA. Without understanding this, it appears that Y-DNA genetic groups with a common genealogical ancestry can appear to have multiple levels or types of positive or tested SNPs when that is not the actual fact.  And this can cause much confusion because of the older lower resolution SNP tests tested then verses the newer ones tested for today.  

For an example of this at FTDNA, please see the Carpenter Cousins Y-DNA Project<ref> Carpenter Cousins Y-DNA Project is a surname project handling genealogy and DNA testing. The Carpenter Cousins Y-DNA Project shows the results of genetic triangulation in its results tables that are cross linked (via Table 1) to the related individual and group lineages. See more at: https://carpentercousins.com </ref> version at FTDNA: https://www.familytreedna.com/public/carpenter%20cousins%20%20dna/default.aspx?section=ycolorized - Group 2 provides an example of different green colored SNP names tested at different times.