At Family Tree DNA, a Y-DNA haplogroup prediction is calculated using genetic distance. The calculation finds your most likely haplogroup. The prediction program compares [...]
Yes, a higher number of compared Y-DNA STR markers does increase the power and accuracy for Time to Most Common Ancestor (TMRCA) calculation. However, [...]
Please order SNPs with the help of an expert if you aren’t sure which SNP(s) will benefit your research. Before ordering, you should ask [...]
For palindromic markers, the infinite allele method counts a difference for two types of changes: a mismatch and a copy number change.
Mismatches occur when the [...]
The following descriptions provide brief overviews of each haplogroup’s origin and geographic distribution.
Haplogroup A is the first Y-chromosome lineage to diverge, [...]
Bob, John, and I have the same Genetic Distance. However, when compared, we have different probabilities for sharing a common ancestor, for example, within eight generations. Why?
FTDNATip™ uses both the number of mismatches and the mutation rates of individual markers in calculations. This means that although two men may have [...]