Re: Phylogenetic question for John Harshman
- From: GCPAXSZJIGKY@xxxxxxxxxxxxx
- Date: Sat, 30 Aug 2008 12:18:00 -0700 (PDT)
spintronic schreef:
A new life form develops and has a single unit of
Heredity. Denoted by a single letter.
Upon every successive modification we re-catagorise
the gene using the next letter in the alphabet. The first
one is "A", & With time, this unit starts to undergo
modification, "A" --->"B", "B" --->"C" etc.
Eventually a new unit of heriditary is gained, which also
undergoes it's own modification, etc etc.
I have placed each unit in a horizontal array. With each box depicted
by integers in the order the genes were gained horizontally.
Our first unit undergoes 3 modifications.
. 1
[A]
[B]
[C]
Either generation now picks up a new unit of Heredity [B] for example,
which now becomes
.1 . 2
[A]
[B][A]
[C]
Then another one
. 1 . 2
[A][A]
[B][A]
[C]
Now either units can undergo modification
. 1. 2
[A][B]
[C][A]
[C][A]
Etc etc.
With an array upto 5 genes (Obviously more could be
added, but for simplicity... ) (And "-" denotes no unit yet)
.1 . 2 . 3. 4 . 5
[A] [-] [-] [-] [-]
Could you make any nested hierarchy you like, as
detailed as possible?
I suppose that in such a simple setup, we would not
get a nested tree but a graph, because one node
can have multiple ancestor nodes, as in your
example, where [CA] develops from both [C] and
[BA]. It would be an oriented graph if development
only happens in the sequence A>B>C..., and only
additions are possible, not deletions.
Because of the much greater complexity of real
"hereditary units" a graph is unlikely in the
extreme in real life.
Regards,
Karel
--
If knowledge can create problems,
it is not through ignorance that we can solve them (Asimov)
.
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