On Sat, 30 Jun 2018 08:21:37 +0200, Paul Schlyter
wrote:

On Fri, 29 Jun 2018 18:23:29 -0600, Chris L Peterson
wrote:
Even if alien life uses
the same genetic chemistry as Earth life, there's no chance it's
going
to code for the same genes (and especially for all the inactive
segments).

The chance may be negligibly small, but claiming that the chance is
zero is an exaggeration.

Not much. If the chance is smaller than can be reasonably allowed for
in the lifetime of the universe, zero isn't a bad assessment. Like the
chance of you appearing on the other side of the Earth because of your
quantum wave function. Non-zero chance, but so small that it can be
treated as such.