Hi, Adam!

You may already be fully aware of this, but there is a big difference
between genetic distance and generational distance. Genetic distance
is how many Y STR markers you don't share with a match. Generational
distance estimates can be viewed by clicking on the TiP icon
underneath your Y DNA match on FTDNA. So, for example, one could have
a genetic distance of 5 with another match, but have a very remote
chance of sharing a common ancestor in the last 5 generations.

Mary Henderson
Genetic Genealogy Research, LLC

Mary Henderson
Genetic Genealogy Research, LLC

On Fri, Nov 8, 2019 at 7:23 PM Adam Cherson adam.cherson@gmail.com
<dna@lyris.jewishgen.org> wrote:

Dear Genetic Genealogists,

I would like to ask the actual geneticists about something I am
encountering in my live research with the J-S12192 set of sub-branches.

In order to help explain this I have made available an image of the
current FTDNA haplotree for this region:

https://www.dropbox.com/s/b2vadr6o9eymufw/S12192_yDNA7or8_08NOV2019.JPG

On the chart I've highlighted my family's yDNA group in gray and the
other groups in yellow.

As shown there, our family is matching persons in haplogroups from
sister branches as closely, or sometimes even more closely, than persons
in our own haplogroup.

I have two questions relating to the tree shown:

1) what could it mean that there are such close Y111 distances between
persons in haplogroups across sister branches?

2) what could it mean the there is such a large gap of time between the
estimated formation of J-S12192 circa 210 CE and the formation of
J-ZS2375 circa 1080 CE, followed by the rapid fire formation of so many
sub-groups of J-ZS2375?