Re: Group selection in the breeding of super chickens
- From: dkomo <dkomo871@xxxxxxxxxxx>
- Date: Wed, 6 Feb 2008 13:34:23 -0500 (EST)
John W Edser wrote:
dkomo <dkomo871@xxxxxxxxxxx>
He describes an experiment by William Muir, a poultry scientist, who
wanted to increase egg production by breeding. Chickens have always
lived in groups, and in the modern egg production industry they are
crammed inhumanely into cages usually containing nine to twelve hens.
Muir tried two different breeding experiments:
1. Select the best egg layer from each of a number of separate cages to
breed the next generation of hens.
2. Select all the hens from the most productive cages to breed the next
generation of hens.
Wilson writes:
"You might think that the difference between the two methods is slight
and that the first method should work better.
JE:-
Both present independent Total Darwinian Fitness (TDF) events so neither
represent group selection. In both cases the fitness of any one group is
just the simple sum of the TDF fitness of each parent within it. If the mean
of 2) remains larger than the mean of 1) then 2) should work better than 1)
where the reverse also remains true.
The cooperation produced within the supposed "group selected" unit
represents an entirely TDF fitness mutualised trait which is not at all
group selected. Each Darwinian individual has to be selected individually on
just an additive in fitness basis within each group. The proposed "group
selection" example represents a good example of the effectiveness of the
Baldwin effect in which only adult individuals can be selected while
allowing groups to provide a selective force on each and every Darwinian
form (each parent) within each group such that THE GROUP DOES NOT ACT AS
ONE GROUP SELECTEE. If TDF can be raised mutually but not equally, then two
interesting predictions arise:
1) The difference between the highest and lowest TDF within the "group
selected" population may become much larger increasing the intensity of
monocentric natural selection within that group when compared to the other
where neither group has been group selected.
2) Evolution within any fitness mutualised group will mostly remain faster
than within any comparable non fitness mutualised group.
W.D. Hamilton et al have to take most of the responsibility for this
catastrophic mix up within evolutionary theory because it was they who
firstly formulated and applied just a misused, contradictory, polycentic
mathematical model within evolutionary theory in order to allow prohibited
by monocentric Darwinism, organism fitness altruism in nature, after group
selection failed to be able to do so.
Define some terms so I know what you are talking about. Define Total
Darwinian Fitness,"fitness mutualised", "moncentric", and "polycentric".
Also, what do you mean by "group selection". I suspect your
definition of group selection differs from mine.
--dkomo@xxxxxxxx
.
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- From: John W Edser
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