Do all FTDNATiP™ calculations offer the ability to add genealogical data? Why don’t you always show it?

When using the FTDNATiP™ calculator in myFTDNA, the box in which to enter the number of generations appears only when you are not comparing [...]

How do I find out the time to the most recent common ancestor in years?

You can convert from generations to years by multiplying the number of generations by an average number of years between generations. In general, you [...]

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, [...]

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 [...]

How do I tell how closely I am related to a Y-chromosome DNA (Y-DNA) match? What is FTDNATiP™?

You may use Family Tree DNA’s Time Predictor, FTDNATiP™, to determine how closely you are related to a match. It provides powerful and precise [...]

Why did the FTDNATiP™ probability become less when we eliminated the possibility of a common ancestor within the past seven generations? It seems that it should increase?

These are cumulative probabilities. That is the key to understanding something that initially seems counter intuitive.

Let’s use an example for a specific situation of [...]