On Fri, 21 Feb 2003 18:09:17 -0500, "H.M. Hubey"
<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.

=======================
Miguel Carrasquer Vidal
mcv@...