Big-Y and SNP Generations
Posted by smithsworldwide in Big Y Discussion and Matched Groupings on August 4, 2022 Views:(486) Replies (0)
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How many years equal a SNP Generation? From ISOGG Wiki:
From ISOGG Newletter Jan 2012
Back to the Big-Y Block tree. On the left side are marking for SNP generations, which represent 5 generations. (Private variants have not yet been assigned as branches on the tree). Keeping in mind the discussion above about how long a generation is, and knowing that each SNP marker represents 5 generations, if the common haplogroup is, say, 5 generations or one SNP marker back, you multiply that times how long a generation is to get how many years. Again, the generations can be between about 30-35 years to 80 or 100 (although 100 seems the outlier).
Here is a very good example from dna-explained where the author uses her own family to calculate common ancestor time. Keep mind as you read this that Big_Y is a deep ancestry test and if you go back 9 generations, even allowing for the range between 30 and 80, that is a very long time back. For genealogical, step by step tracing of an ancestor, especially where source records are lacking, details about countries of origin are unknown, and trees are inaccurate, will be challenging.