Re: How do cells know if they're a skin cell, blood cell, etc...

From: r norman (rsn__at__comcast.net)
Date: 02/11/05 

Date: Fri, 11 Feb 2005 01:14:18 -0500 (EST)

On Thu, 10 Feb 2005 17:51:34 -0500 (EST), CNCabej@aol.com wrote:

>
>
>r norman wrote:
>
>In the same way, no doubt, that the brain of an oak tree helps build
>the brain of the acorn that will then grow into another oak.
>
>NRC:
>??? !!!
>
>r norman:
>
>I agree that cytoplasmic factors in the maternal contribution, the
>egg, are critically important in controlling the growth and
>development of the zygote. In the case of plants, cytoplasmic factors
>in the spore mother cell are critically important in controlling the
>growth and development of the gametophyte. However the brain has
>little or nothing to do with it.
>
>NRC:
>If you agree that cytoplasmic factors, i.e. the epigenetic information
>deposited in the egg, are critically important for the growth and
>development, the fact that deposition of those factors is regulated by
>the CNS (see evidence in Part 1 of my article "The Epigenetic System of
>Heredity") is incompatible with your assertion that "the brain
>has...nothing to do with it". But, if you believe that the brain has
>"little" to do, can you elaborate how little (or what) is that
>"little"?
>
>Regards,
>
>Nelson R. Cabej
>

My news reader now includes your posting under the subject line "A
kook-enabler's apology". So I must apologize to all other readers for
my enabling you..

My point, in case it was too subtle for you, remains that there are a
vast number of multicellular eukaryotic creatures belonging to several
kingdoms that have growth and development, differentiated cell types,
and all the rest, with cytoplasmic factors in the egg helping regulate
development of the embryo, all with absolutely no trace of a nervous
system whatsoever.

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