Are there limitations to the current recombination rates?

Yes. Limitations in the number of global populations used and the number of samples tested in the International HapMap recombination rate studies limit what [...]

If two DNA segments look about the same length, why aren’t they the same number of centiMorgans?

The recombination rate across the human autosomal genome is highly variable. Therefore, DNA segments that are the same number of base pairs long may [...]

If two people share part of the same DNA segment with me, will the centiMorgan value for each segment be proportional to how long the segments look?

Overlapping DNA Segments

cM
Matching on Chromosome 1

Match 1

Match 2

Non-Match

20.5

7.6

No. Part of a matching DNA segment may have a higher or lower centiMorgan (cM) value than [...]

Is it more significant if two of my matches have identical start and stop points than if the segments simply overlap?

No. When two of your matches’ DNA segments share exact start and stop points, it is not more significant than when they simply overlap. [...]

Does the Family Finder test use mitochondrial DNA (mtDNA) test results?

No. The Family Finder software does not use mitochondrial DNA results for matching or relatedness calculations. The Family Finder program uses only the autosomal SNP [...]

Does the Family Finder test use Y-chromosome DNA (Y-DNA) test results?

No. The Family Finder software does not use Y-chromosome DNA (Y-DNA) results for matching or relatedness calculations. The Family Finder program uses only the autosomal [...]