Paper: Key Evolutionary Question Largely Unknown

I think we should all gladly embrace the miracle of evolution.Mung

September 18, 2014

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as to:

"In their study they showed that increasing the expression of a regulatory gene, late in the embryonic development phase, resulted in more teeth in the threespine stickleback fish."

That they had to use 'a regulatory gene, late in the embryonic development phase', is not surprising since early acting mutations are always catastrophically bad. As Paul Nelson put the problem,,

Darwin or Design? - Paul Nelson at Saddleback Church - Nov. 2012 - ontogenetic depth (excellent update) - video Text from one of the Saddleback slides: 1. Animal body plans are built in each generation by a stepwise process, from the fertilized egg to the many cells of the adult. The earliest stages in this process determine what follows. 2. Thus, to change -- that is, to evolve -- any body plan, mutations expressed early in development must occur, be viable, and be stably transmitted to offspring. 3. But such early-acting mutations of global effect are those least likely to be tolerated by the embryo. Losses of structures are the only exception to this otherwise universal generalization about animal development and evolution. Many species will tolerate phenotypic losses if their local (environmental) circumstances are favorable. Hence island or cave fauna often lose (for instance) wings or eyes. http://www.saddleback.com/mc/m/7ece8/

and,,,

A Listener's Guide to the Meyer-Marshall Debate: Focus on the Origin of Information Question -Casey Luskin - December 4, 2013 Excerpt: "There is always an observable consequence if a dGRN (developmental gene regulatory network) subcircuit is interrupted. Since these consequences are always catastrophically bad, flexibility is minimal, and since the subcircuits are all interconnected, the whole network partakes of the quality that there is only one way for things to work. And indeed the embryos of each species develop in only one way." - Eric Davidson http://www.evolutionnews.org/2013/12/a_listeners_gui079811.html

as to rapid loss of body armor

"Threespine sticklebacks, small fish found around the globe, undergo rapid evolutionary change when they move from the ocean to freshwater lakes, losing their armor and gaining more teeth in as little as 10 years."

As you pointed out Dr. Hunter, this 'rapid evolutionary change' is not evidence in favor of neo-Darwinism, but is evidence of the 'top down' model of 'limited variation within kind':

"One hint that biology would not cooperate with Darwin’s theory came from the many examples of rapidly adapting populations. What evolutionists thought would require thousands or millions of years has been observed in laboratories and in the field, in an evolutionary blink of an eye." Cornelius Hunter Evolution of adaptive phenotypic traits without positive Darwinian selection - A L Hughes - November 2011 Excerpt: Recent evidence suggests the frequent occurrence of a simple non-Darwinian (but non-Lamarckian) model for the evolution of adaptive phenotypic traits, here entitled the plasticity–relaxation–mutation (PRM) mechanism. This mechanism involves ancestral phenotypic plasticity followed by specialization in one alternative environment and thus the permanent expression of one alternative phenotype. Once this specialization occurs, purifying selection on the molecular basis of other phenotypes is relaxed. Finally, mutations that permanently eliminate the pathways leading to alternative phenotypes can be fixed by genetic drift. Although the generality of the PRM mechanism is at present unknown, I discuss evidence for its widespread occurrence, including the prevalence of exaptations in evolution, evidence that phenotypic plasticity has preceded adaptation in a number of taxa and evidence that adaptive traits have resulted from loss of alternative developmental pathways. The PRM mechanism can easily explain cases of explosive adaptive radiation, http://www.nature.com/hdy/journal/vaop/ncurrent/full/hdy201197a.html A. L. Hughes's New Non-Darwinian Mechanism of Adaption Was Discovered and Published in Detail by an ID Geneticist 25 Years Ago - Wolf-Ekkehard Lönnig - December 2011 Excerpt: The original species had a greater genetic potential to adapt to all possible environments. In the course of time this broad capacity for adaptation has been steadily reduced in the respective habitats by the accumulation of slightly deleterious alleles (as well as total losses of genetic functions redundant for a habitat), with the exception, of course, of that part which was necessary for coping with a species' particular environment....By mutative reduction of the genetic potential, modifications became "heritable". -- As strange as it may at first sound, however, this has nothing to do with the inheritance of acquired characteristics. For the characteristics were not acquired evolutionarily, but existed from the very beginning due to the greater adaptability. In many species only the genetic functions necessary for coping with the corresponding environment have been preserved from this adaptability potential. The "remainder" has been lost by mutations (accumulation of slightly disadvantageous alleles) -- in the formation of secondary species. http://www.evolutionnews.org/2011/12/a_l_hughess_new053881.html

It is also interesting to note just how rapid the adaptations can happen, and also that the 'plastic' adaptations are reversible if deleterious mutations have not yet accumulated:

Lizard (cecal valve) Plasticity - March 2013 Excerpt: So in this study, plasticity experiments were conducted. When the lizards were taken off a plant diet and returned to their native insect diet, the cecal valves in their stomachs began to revert within weeks. As the authors conclude, this pointed heavily to plasticity as a cause. We can infer that the this gut morphology likewise arose in similar fashion when coming into contact with the plant diet. http://biota-curve.blogspot.com/2013/03/lizard-plasticity.html Phenotypic Plasticity - Lizard cecal valve (cyclical variation)- video http://www.youtube.com/watch?v=zEtgOApmnTA

Of related interest to 'gaining teeth' in stickleback, is this experiment with teeth that I recently learned about. An experiment in which 'form' took precedence over the material particulars of the teeth,,,

DNA doesn’t even tell teeth what they should look like - April 3, 2014 Excerpt: A friend writes to mention a mouse experiment where developing tooth buds were moved so that the incisors and the molars were switched. The tooth buds became the tooth appropriate to the switched location, not the original one, in direct contrast to what we would expect from a gene’centric view. per Uncommon Descent

In other words, body plans, (i.e. the form), is not reducible to the sequences of DNA as is presupposed in neo-Darwinism. Here are a few more notes that undermine any neo-Darwinian claim that DNA sequences determine morphology:

Getting Over the Code Delusion (Epigenetics) - Talbot - November 2010 Excerpt: As bioinformatics researcher Elliott Margulies and his team at the National Human Genome Research Institute put it, “the molecular shape of DNA is under selection” — a shape that can be maintained in its decisive aspects despite changes in the underlying sequence. It’s not enough, they write, to analyze “the order of A’s, C’s, G’s, and T’s,” because “DNA is a molecule with a three-dimensional structure.”[14] Elementary as the point may seem, it’s leading to a considerable reallocation of investigative resources. http://www.thenewatlantis.com/publications/getting-over-the-code-delusion The Gene Myth, Part II - August 2010 Excerpt: “It was long believed that a protein molecule’s three-dimensional shape, on which its function depends, is uniquely determined by its amino acid sequence. But we now know that this is not always true – the rate at which a protein is synthesized, which depends on factors internal and external to the cell, affects the order in which its different portions fold. So even with the same sequence a given protein can have different shapes and functions. Furthermore, many proteins have no intrinsic shape, taking on different roles in different molecular contexts. So even though genes specify protein sequences they have only a tenuous (very weak or slight) influence over their functions. ,,,,So, to reiterate, the genes do not uniquely determine what is in the cell, but what is in the cell determines how the genes get used. Only if the pie were to rise up, take hold of the recipe book and rewrite the instructions for its own production, would this popular analogy for the role of genes be pertinent. Stuart A. Newman, Ph.D. – Professor of Cell Biology and Anatomy http://darwins-god.blogspot.com/2010/08/gene-myth-part-ii.html

In terms of explaining morphology, here is 'a jaw dropper',,

An Electric (Frog) Face: A Rendering Worth a Thousand Falsifications - September 2011 Excerpt: The video suggests that bioelectric signals presage the morphological development of the face. It also, in an instant, gives a peak at the phenomenal processes at work in biology. As the lead researcher said, “It’s a jaw dropper.” https://www.youtube.com/watch?v=0VULjzX__OM

bornagain77

September 18, 2014

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