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> Tim Tyler  wrote in message
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> >  * Disposable soma
> > 
> >    This states that reproductive and maintenance processes compete for 
> >    resources. Reproducing early clearly has many advantages - and is 
> >    consequently somatic tissue maintenance programs do not receive 
> >    sufficient investment to support indefinite survival.  
> > 
> >  * Antagonistic pleiotropy
> >  
> >    This theory proposes that genes that delay the expression of 
> >    deleterious genes are favoured.  More generally, it suggests that 
> >    alleles may be favoured if they have beneficial early effects but 
> >    deleterious later effects.
> 
> The trade-off described by "Disposable soma", as you have described
> it, is equivalent to general "Antagonistic pleiotropy". In both cases,
> variants arise which either promote functioning early or late, and
> early is favoured as here reproductive value is highest.

Antagonistic pleiotropy - by definition - refers to the effects of
a single genetic trait.

Disposible soma seems the more general theory - since there
is no implication of following the expression of any particular
gene - and tradeoffs made between resource expenditure on
different functions do not necessarily have to be performed
under the control of any particular locus.

Antagonistic pleiotropy seems deserving of its own name though -
since alleles delaying the expression of deleterious traits - and
alleles with beneficial early effects but negative long-term
consequences - are both common.
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