Re: Metamorphosis - plausible evolutionary scenario?


Lorentz <drosen0000@xxxxxxxxx> wrote:-

The current idea is like Perplexed is talking about. The
butterfly parts grow out of imagal cells on the caterpillar. Imagal
cells are embryonic cells where the development was delayed until well
into larvahood. The other cells develop all the organs needed by a
growing caterpillar, but the imagal cells remain pretty much as they
did in the egg. That is, until the pupa stage. When the caterpillar
reaches the magic moment, the imagal cells grow catastrophically.
The sudden growth of imagal cells damages some of the caterpillar
organs, which is what I think Gould meant by "liquify."

JE:-
My main points with specific reference to evolutionary theory (no just
physiology):

1) The Darwinian cycle of fertile form --> fertile from provides THE ONLY
cycle which can interpret these events within evolutionary theory. The
starting and ending of this cycle at any other stage as just a model
represents a critical oversimplification of the empirically based Darwinian
cycle where cause and effect within evolutionary theory may become reversed.
Any uncorrected model will _critically misrepresent_ the theory it was
oversimplified from.

2) The genes that code for the delayed imagal cells which suddenly grow
within the chrysalis can only be selected to do so within the soma (body) of
the fertile adult stage and not within the infertile caterpillar stage,
itself. The infertile stage can only present a platform on which to _select
against_ genes. Genes can only be _selected for_ within the fertile form
which represents one fitness independent Darwinian selectee.

Regards,

John Edser
Independent Researcher

edser@xxxxxxxxxxxxxx



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