[ExI] Strange mystery explained

[Keith Henson]

"Stuart LaForge" <avant at sollegro.com> wrote:

Keith Henson wrote:

>> However, to cut to the chase, it looks like patrilineal early farming
>> groups were killing off each other's males.  This considerably diminished
>> the variations of Y chromosomes since when one group got the upper hand,
>> it was common for the winners to kill the losers to the last man (and boy)
>> and take the young women as booty.  It seems this process started when the
>> Neolithic agricultural revolution began
>> and ended when violence between patrilineal clans was suppressed by
>> Chieftains or a State.
>. https://www.nature.com/articles/s41467-018-04375-6#article-comments
.
>The author's hypothesis convincingly tells us "what" happened but doesn't
>tell us "how" it happened. The winners killing the losers to last man is
>not sufficient to explain the bottle neck, because it does not explain why
>the winners were consistently the winners in each and every confrontation.

They didn't need to be.  The only requirement for their model was that
one patrilineage wiped out another.  This happened many times over
thousands of years and thinned down the number of Ys.

Keith