On Thu, Mar 30, 2017 at 11:21 AM, John R Carpenter <jrcrin001(a)cox.net> wrote:
Y-DNA markers rarely indicate health or medical issues. Nulls or
missing DYS
markers by themselves are quirks or unique events in the Y-DNA markers
tested with no known medical or health issues. But on very rare occasions
where the DYS-464a,b,c,d marker value should be listed, but posted with
numerical zeros ( 0, 0, 0, 0 ) or nulls by FTDNA, it could imply sterility
Yes, that's much better. The only quibble is that FTDNA actually posted
just two zeroes, not four, in the one case we have seen of missing DYS464
altogether. This makes sense in a quirky sort of way, since FTDNA makes
a practice of posting the actual number of values seen when that number
differs from four, and they have apparently never convincingly detected only
a single copy of DYS464.
John Chandler