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firemonkey
10-14-2017, 05:39 PM
When do private snps cease to be private snps?

RobertCasey
10-14-2017, 06:57 PM
There are two ways: 1) if the YSNP becomes a terminal YSNP (lowest YSNP on the haplotree), it takes a second person testing positive for the private YSNP; 2) if the YSNP is being placed on haplotree above any terminal YSNP, it takes one negative tester of the YSNP and two positives for any sons of the new branch (this splits out a formerly branch equivalent into a branch defining YSNP). The second scenario is really not a private YSNP being converted - it is a branch equivalent being promoted to a branch defining YSNP.

Cofgene
10-15-2017, 12:46 PM
There are two ways: 1) if the YSNP becomes a terminal YSNP (lowest YSNP on the haplotree), it takes a second person testing positive for the private YSNP; 2) if the YSNP is being placed on haplotree above any terminal YSNP, it takes one negative tester of the YSNP and two positives for any sons of the new branch (this splits out a formerly branch equivalent into a branch defining YSNP). The second scenario is really not a private YSNP being converted - it is a branch equivalent being promoted to a branch defining YSNP.

Actually it would be better to state that it is when the variant is shared by 2 or more individuals on the SAME haplogroup branch. A variant may be present in another tester who resides under a different haplogroup branch. That occurrence has no phylogenetic relevance to the tester.