Frozen Evolution

The accumulation of small heritable changes within populations over time.

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Frozen Evolution

#1  Postby tuco » May 18, 2010 8:14 am

Or, that's not the way it is, Mr Darwin
A farewell to Selfish Gene

Frozen plasticity theory

This theory suggests a mechanism of the origin of adaptive traits in sexual organisms. The classical Darwinian mechanism of the origin of adaptive traits by natural selection can explain the evolution of such traits only under a very special situation, e.g., in a genetically homogeneous population of asexual organisms. The frozen plasticity theory is much more general: It can also explain the origin and evolution of adaptive traits in a genetically heterogeneous population of sexual organisms.

http://www.frozenevolution.com/

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Not sure if this should be here or in debunk section, so feel free to move it there if necessary. Other than that .. thoughts?
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Re: Frozen Evolution

#2  Postby Animavore » May 18, 2010 8:26 am

Exceedingly interesting.

Book-marked :coffee:
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Re: Frozen Evolution

#3  Postby Allan Miller » May 18, 2010 12:23 pm

tuco wrote:Or, that's not the way it is, Mr Darwin
A farewell to Selfish Gene

Frozen plasticity theory

This theory suggests a mechanism of the origin of adaptive traits in sexual organisms. The classical Darwinian mechanism of the origin of adaptive traits by natural selection can explain the evolution of such traits only under a very special situation, e.g., in a genetically homogeneous population of asexual organisms. The frozen plasticity theory is much more general: It can also explain the origin and evolution of adaptive traits in a genetically heterogeneous population of sexual organisms.

http://www.frozenevolution.com/

-----

Not sure if this should be here or in debunk section, so feel free to move it there if necessary. Other than that .. thoughts?


Aside from a natural knee-jerk skepticism regarding 'new theories of evolution', it may be of interest to peruse this from Biology Direct. BD has the interesting strategy of allowing anyone to publish provided they can get three reviewers who can be arsed to review. Reviewer comments are published along with the article.

I'd like to comment in more detail myself, but I'm busy working on a stunning new theory of evolution.
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Re: Frozen Evolution

#4  Postby David M » May 19, 2010 12:27 pm

The classical Darwinian mechanism of the origin of adaptive traits by natural selection can explain the evolution of such traits only under a very special situation, e.g., in a genetically homogeneous population of asexual organisms.


Is just flat out wrong and contradicted by the evidence.
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Re: Frozen Evolution

#5  Postby Leonidas » May 22, 2010 10:56 pm

Frozen plasticity theory
This theory suggests a mechanism of the origin of adaptive traits in sexual organisms. The classical Darwinian mechanism of the origin of adaptive traits by natural selection can explain the evolution of such traits only under a very special situation, e.g., in a genetically homogeneous population of asexual organisms.

A misunderstanding here and a big one. Darwinian evolution does NOT say that adaptive traits originate by natural selection. Natural Selection acts on naturally occurring variation. Darwin did not know the cause of that variation. We now know about mutations and DNA. Mutant genes arise due to faulty replication of existing genes. This usually produces a faulty gene which either kills or handicaps an organism. But sometimes a mutation is advantageous. Natural selection determines whether a mutant gene dies out or is propagated.

The frozen plasticity theory suggests that sexual species can evolve new adaptations by accumulation of random mutations only when their members are genetically uniform, i.e., only after a portion of the population of the original species has split off, balanced on the edge of extinction for several generations, and then undergone rapid expansion.

This confuses mutation with speciation. Mutations occur and spread through a population all the time. Even disadvantageous mutations can survive for a time, especially if there is a non-handicapped heterozygote. A famous example is the haemophylia gene that came from Queen Victoria and was passed onto many of her descendants in the royal families of Europe, including the son of the last Tsar of Russia.

For speciation to occur there does have to be reproductive isolation of two populations. This means that neither population can pass on mutant genes to the other. Eventually the two populations will be very different. Near extinction is not necessary, just sustained isolation.

After a short period of time, corresponding to 1-2% of the duration of the species (estimated on the basis of paleontological data), polymorphism accumulates in the gene pool due to frequency-dependent selection; and thus, in each generation, new mutations occur in the presence of different alleles and therefore change their selection coefficients from generation to generation.

I don't know about the numbers but basically isolated populations drift apart. That is standard evolutionary theory.

The species ceases to behave in an evolutionarily plastic manner and becomes evolutionarily elastic on a microevolutionary time-scale and evolutionarily frozen on a macroevolutionary time-scale. It then exists in this state until such changes accumulate in the environment that the species becomes extinct.

Sounds like gibberish to me, but then I have not read the full explanation. WHY is a question that immediately occurs. What is the mechanism for this declaration or is it no more than a declaration? The next point is that if a species becomes extinct due to being unable to cope with a changed environment then that also is standard evolutionary theory, natural selection and all. Most species become extinct without leaving descendants.
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Re: Frozen Evolution

#6  Postby wunksta » May 22, 2010 11:00 pm

Leonidas wrote:Mutant genes arise due to faulty replication of existing genes. This usually produces a faulty gene which either kills or handicaps an organism. But sometimes a mutation is advantageous.


most mutations are completely neutral. only a small percentage are actually deleterious or advantageous
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