Re: Step Question
- I'd like to add on to Susan's post here and say that whether or not to pursue a large step difference depends a lot on how many markers were tested. The more markers tested, the higher you can go in the genetic differences and be worth a harder look. So a genetic difference of 5 at 67 markers is most likely going to be worth pursuing additional research than a genetic distance of 5 at 37 markers.
--- In R1b-L21-Project@yahoogroups.com, Susan Hedeen <chantillycarpets@...> wrote:
> The step count is what it infers. The distance counting from another
> haplotype makes no real discrimination about what kind of a mutation any
> given locus shows; in other words that 2 step could be the difference
> between 2 loci values as in for example 13 24 14 *10*/13 24 14 *12*; the
> highlighted values is equal to 2 steps in that particular loci. With a
> 7 step difference generally being a combination of 1 step and 2 step
> differences, although this is not a hard and fast rule...
> This is opposed to a mutation counting method called infinite allele in
> which regardless of distance each value difference is counted as 1 for
> example, that 10--12 difference would be counted as 1.
> The reason why FTDNA examples these is to cover their bases; hence they
> will show the number of steps away in any 2 samples, but in their close
> matching supposedly they use the infinite allele mutation counting to
> assess them.
> 2 step differences may occur in a single mutation event...this is more
> clearly seen in same surname lineages which are compatible in their YDNA
> signatures; however in FTDNA's matching they do not necessarily pay
> attention to surnames, haplogroups, sub-clades. Often there will be
> matches showing in different sub-clades, rarely in different
> haplogroups, but with the lower marker panels such as the 12 marker
> format it has happened. Hope this helps. susan
Mike:Kit 179146 Desmond has 594=3. Is this real, or has some sort of error occurred?------ Joe