> On Fri, 21 Feb 2003 18:09:17 -0500, "H.M. Hubey"How so?
> <hubeyh@...> wrote:
>
> >Piotr Gasiorowski wrote:
> >> Sort of, to the extent that human-family-based metaphors are
> >> applicable to cladistic models. Technically, we speak of "sisterhood"
> >> between taxa A and B if A and B have the same _immediate_ ancestor,
> >> that is when the last common ancestor of A and B split into A and B
> >> and nothing else:
> >>
> >> Proto-AB --+--A
> >> |
> >> `--B
> >
> >What if A is still identical to AB and that it was only B that innovated
> >and branched off?
>
> That would violate the second law of thermodynamics.