I get confused on the biology and paleontology terms, and even mixed up
and fixed the terms in writing this.  I think a 'phenotype' isn't
actually referring to organisms, but one idealized form of organism
resulting from a given set of genes.  There's apparently more than one
possibility of what type of organism will result from the same set of
genes.  I don't know if it's a technical distinction or actually
alternate forms.   One of my technical distinctions would be that when
talking of biological development everyone is almost always talking
about the growth of individual organisms, as you seem to be, not
phenotypes.  There may be no evidence at all of the 'growth' of
phenotypes.   One might call the growth of an organism the 'expression
of a phenotype' as if the 'type' exists independently of the individuals
we see the pattern in.

Anyway, developmental biology is a big field. One of my favorites on
biological form isn't really about the systems of development, patterns
of biological form.  Try D'Arcy Thompson's ancient text "On Growth and
Form"    http://en.wikipedia.org/wiki/Developmental_biology is also
good.

> 
> The development of the phenotype is perhaps 
> the most spectacular form of growth. Even if you 
> know the principles of epigenesis, morphogenesis 
> and molecular biology, it is still amazing how 
> a redwood tree can emerge from a single seed, 
> how a tyrannosaur can develop from a small egg, 
> and how a single cell can grow to a blue whale.
> Does someone know good general books about this 
> topic ?
> 
> -J.
> 
> 
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