Re: Thoughts or Ideas from new Eyes please Gary or ?
How long does an overlapping segment need to be to indicate a common ancestor in the Chromosome browser?
I did the tutorial in the Chromosome browser, but I don't really "get" it.
It seems as though physically longer segments don't necessarily translate into numerically longer segments.
Tue Sep 3, 2013 7:26 pm (PDT) . Posted by:
> Basically is the guy below-Alberto M. (who is related on ourshare
> Sanchez Y 36/37) AND the two FF 3rd cousins---Alfred Sanchez and
> Arthur Contreras---does this mean that these 3 guys most likely
> grt grt grandparents? (Alfred and Arthur are 1st cousins to eachThey all could be a different gggrandparent and they may not be a gggrandparent as these are estimates. The way to find out if there is a common ancestor between these lines is to use the Chromosome browser to see if you have an overlapping segment and how long is it.
> other). I don't even KNOW who Alberto M. is!
- Hi Peggy,
some SNP's take up a lot of real estate so they appear longer than others with the same amount of SNP's.
As a general rule I would use lengths of 5cM or you risk being identical by state or IBS rather than descent IBD. Of course the more cM's the better.
--- In MexicoDNAProject@yahoogroups.com, Peggy Deras <pderas@...> wrote:
> How long does an overlapping segment need to be to indicate a common
> ancestor in the Chromosome browser?
> I did the tutorial in the Chromosome browser, but I don't really "get" it.
> It seems as though physically longer segments don't necessarily
> translate into numerically longer segments.