Question

What factors make mitochondrial DNA particularly useful for determining ancestory.

Answer 1

The mtDNA does not change as more rapidly as that of nuclear DNA, and because it is not at all being mixed with the father’s (paternal) DNA, it actually leaves a clearer entry of distant ancestry – although only from the mothers’ (maternal ancestry)... It's analysis can be used for finding ancestry.

mtDNA testing also provides information about the ancestry not always grom regular DNA testing. It also provide some of the clearest proof of relationships between the people with the same mother, grandmother, great grandmother, and so on.