How does Y-chromosome DNA (Y-DNA) haplogroup prediction work?

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 [...]

Will testing additional STR markers improve FTDNATiP™ calculations?

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, [...]

How do I know which SNPs make sense for me to order?

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 [...]

How does the infinite allele comparison method work for palindromic markers?

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 [...]

What is the geographic and historic origin of my Y-chromosome DNA (Y-DNA) haplogroup?

The following descriptions provide brief overviews of each haplogroup’s origin and geographic distribution.
Haplogroup A
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 [...]