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From: dunc_harris@hotmail.com (Duncan Harris)
Newsgroups: alt.fan.uncle-davey
Subject: Re: Is there a link between dominance/recessivity of genes and earlier evolutionary forms?
Date: Sun, 29 Feb 2004 19:16:47 +0000 (UTC)
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"Uncle Davey" <noway@jose.com> wrote in message news:<c1r0vu$btv$0@pita.alt.net>...
> Has anyone done any work on this topic?
>
> It seems to me as though the 'wild forms' of animals tend to have the
> dominant characteristics. When a wild boar mates with a pig, the offspring
> have more the shape of a wild boar, there is no fattening them up like a
> domesticated pig, and so the farmers hate when that happens.
>
> Can we see a general tendency that wild characteristics are dominant and
> ones bred in are nore recessive?
>
> Uncle Davey
There are two theories to explain dominance.
The first is that dominance is due to biochemical reasons. i.e. a
gene is expressed if it is present, and not if it is not. See other
people's notes.
The Second is Sir Ronald Fisher's theory on the evolution of dominance
which was contended by Sewall Wright who thought the first was true
(these two really did not like each other). Basically the theory is
that there are alleles that spread through a population by natural
selection to make deleterious alleles recessive so that they are
hidden by the cloak of "heterozygosity". This can be modelled.
see Fisher's papers (might take a while to download) at
http://www.library.adelaide.edu.au/digitised/fisher/genetics.html
There is reason to believe that both are in fact correct in different
circumstances.
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