Sam I wrote the blogpost specifically to get away from such broad generalities. I don't want to try to paint an entire population with one brush stroke. You need to look at each case separately to draw any conclusions. If you insist on treating it as a homogeneous group, you'd need to guess at the Endogamy factor. Say you guess it's 17... Then you'd assume your Match also had 17. In that case you'd multiply the nominal shared DNA for a cousinship level by 34. Jim - www.segmentology.org > On Dec 2, 2015, at 6:59 PM, Sam Sloan <samhsloan@gmail.com> wrote: > > In Pakistan, 80% of the population is married to their first cousin. How does that affect their DNA? > > Sam Sloan > >> On Wed, Dec 2, 2015 at 12:43 PM, Jim Bartlett via <genealogy-dna@rootsweb.com> wrote: >> I just published a blogpost about endogamy - shared DNA >> at http://segmentology.org/2015/12/02/endogamy-i/ >> The bottom line is that endogamy only affects the shared DNA when you >> and/or your Match have your Common Ancestor in you Tree(s) more than >> once. >> For each time the Common Ancestor is repeated in a Tree, the nominal >> shared DNA is multiplied by that factor: E3 is 3 CAs in a Tree and the >> nominal total shared DNA will be multiplied by 3. >> In general endogamy does not increase the size of shared segments, just >> the total amount. >> In general, we don't have close endogamy, it's usually back in our >> ancestry somewhere. The multiplying effect of endogamy is offset by the >> small amounts of shared DNA with distant cousins. >> However, between endogamy and wide tails on cM distribution curves, we >> get enough shared DNA so that most of our Matches appear to be in the >> 6-8th cousinship range. >> >> >> Jim Bartlett www.segmentology.org >> >> >