Family Tree DNA does not have a file format for Y-chromosome DNA single nucleotide polymorphism (SNP) results. However, your raw data, the actual values for each SNP, will be available on the Y-DNA - Haplotree & [...]
Yes. It is possible that a SNP will back mutate (change back). However, SNPs are slow changing. Thus, back mutations are uncommon.
No, the names in the mitochondrial DNA (mtDNA) haplogroups do not correspond with the same names in the Y-chromosome DNA (Y-DNA) haplogroups.
FamilyTreeDNA updates the phylogenetic tree when we have substantial evidence that there is a new branch or a new placement for a branch.
Y-Chromosome DNA (Y-DNA) haplogroups and subclades names follow the conventions of the Y-Chromosome Consortium's (YCC). The YCC short form names haplogroups with the first letter from the major haplogroup branch. This is followed by a dash and [...]
At FamilyTreeDNA, a Y-DNA haplogroup prediction is calculated using genetic distance. The calculation finds your most likely haplogroup. The prediction program compares your Y-DNA STR (short tandem repeat) profile to our results database. The program [...]