G'morning Paul, 

 PR> but if that cell splits after dividing, on a path to make
 PR> identical twins, it is no longer unique.  If the instant of
 PR> conception is your definition, then identical twins must be
 PR> two halves of one individual.

Nicely differentiated !

 PR> I've been raising pigeons seriously for over a half century,
 PR> and that includes significant attention to genetics.  I often
 PR> deal with fertilized eggs.  Not all of which I allow to be
 PR> incubated.

Methinks a similar intervention is on its way for mankind, slowly 
but inexorably...

:-)
 
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