Karen, To expand a bit on Tim's, ". . . essentially true." We are dealing with randomness and chaos(used as a mathematical term). So, be prepared for the instances when things don't exactly follow your guideline. Watch out for, among other things, IBS segments attached at the ends of shorter IBD segments. Dr Turner has gone into great detail on these. Still, it is a reasonable, though not infallible, guideline. Sam ------------------------------- Dear Karen, Crossovers break up the long segments of DNA with each successive generation, so what you are suggesting below is essentially true. You have to do a chromosome by chromosome analysis to see which segments came from which grandparent, great grandparent, etc. Sincerely, Tim Janzen

Thanks Tim and Sam I was just trying to think of a logical way of choosing which branches to look at with trying to find a connection to another match when neither of us have genealogy that overlaps. Most of my matches are with people in the USA whose trees haven't gone back overseas and my ancestry is British and Irish. Sam thanks for mentioning about IBD and IBS being together in a segment; I haven't heard of this. Karen On Thu, Jan 12, 2012 at 7:19 AM, Sam Eaton <[email protected]> wrote: > Karen, > > To expand a bit on Tim's, ". . . essentially true." We are dealing with > randomness and chaos(used as a mathematical term). So, be prepared for the > instances when things don't exactly follow your guideline. Watch out for, > among other things, IBS segments attached at the ends of shorter IBD > segments. Dr Turner has gone into great detail on these. > > Still, it is a reasonable, though not infallible, guideline. > > Sam > > ------------------------------- > > Dear Karen, > Crossovers break up the long segments of DNA with each successive > generation, so what you are suggesting below is essentially true. You have > to do a chromosome by chromosome analysis to see which segments came from > which grandparent, great grandparent, etc. > Sincerely, > Tim Janzen > > > ______________________________ > For answers to Frequently Asked Questions about mailing lists, please see: > http://dgmweb.net/MailingListFAQs.html > > > ------------------------------- > To unsubscribe from the list, please send an email to > [email protected] with the word 'unsubscribe' without > the quotes in the subject and the body of the message >