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Jack Russell Terriers and
Cockroaches: A Challenge to Richard Dawkins
Richard Dawkins reviewed
Mike Behe’s new book The
Edge of Evolution in the June 30 New York Times Book Review.
Dawkins offered no surprises. Much of the review was simply a sneer:
I had expected to be as irritated by Michael
Behe’s
second
book as by the first. I had not expected to feel sorry for him…[this]
is the book of a man who has given up. Trapped along a false path of
his own rather unintelligent design, Behe has left himself no escape.
Poster boy of creationists everywhere, he has cut himself off from the
world of real science.
Nothing new here.
Dawkins uses the standard Darwinist ad-hominem
attacks. What’s remarkable about the review is Dawkins’ lack of
substantial scientific criticism of Behe’s point in Edge of Evolution.
Behe makes the observation that there are limits to the amount of
specified complexity that random mutation and natural selection can
generate, and that there is reason, based on evidence such as the
biochemistry of drug resistance of the malaria parasite, to infer that
random mutation and natural selection may be adequate to explain some,
but not all, observed biological complexity. It’s a fair and obvious
question: how much functional biological complexity can random mutation
and natural selection actually generate? Can it account for all of the
biological complexity that we actually observe?
Dawkins
answers Behe in three ways. First, after the sneers, he quotes Judge
John E. Jones’s decision in the Dover case, labeling the Dover
citizens’ efforts to discuss intelligent design and to freely criticize
Darwin’s theory in schools “breathtaking inanity”. Then he extols
biologist Ken Miller’s speculations as to how the bacterial flagellar
motor ‘could have’ evolved as offering decisive refutation of Behe’s
concept of irreducible complexity. Neither of Dawkins’ answers involves
a scientific refutation of Behe.
Finally, Dawkins
offers science, and I assume it’s his best shot. He points out that dog
breeding
provides evidence that mutation rates don’t limit evolutionary change.
He cites Jack Russell terriers! We’ll leave aside Dawkins’ highly
questionable assumption that the variation with which dog breeders work
is primarily the result of new mutations, rather than established
variation in the population. In his dog breeding analogy, Dawkins uses
a bit of ‘pseudo-Darwinism’, a rhetorical tic in which Darwinists try
to defend Darwin’s theory of random variation and natural selection by
invoking either non-random variation (bioengineering) or artificial
selection (breeding). Dawkins’ invocation of pseudo-Darwinism means one
thing: he doesn’t have actual convincing examples of the generation of
significant new specified biological complexity by real Darwinism-
random mutation and natural selection. Which is Behe’s point.
Dawkins was unable to offer a convincing example of
natural
selection, so he used artificial selection. I’ll use an example of the
real thing:
Imagine that I am a microbiologist,
and I culture bacteria in a
medium containing an antibiotic, and put the culture of bacteria in an
incubator while I go on vacation. I return a week later. When I open
the incubator, I find two changes in the culture. The bacteria have
developed resistance to the antibiotic, and there are cockroaches
crawling in the petri dish. I conclude two things:
1)
Random mutation and natural selection are likely responsible for the
bacterial resistance to the antibiotic.
2) Random mutation and natural selection are not responsible for the
cockroaches. They didn’t evolve from the bacteria in a week. They came
from somewhere else (they crawled into the incubator from the outside).
Yet, according to Darwin’s theory, cockroaches really
did
evolve
from ‘bacteria-like’ ancestors over billions of years. So, what’s the
threshold of time after which I could plausibly infer that random
mutation and natural selection was an adequate explanation for the
cockroaches, starting with bacteria? How long would I have to leave the
bacteria in the incubator before it would be plausible to infer that
the cockroaches evolved from the bacteria? A million years? A billion
years? Perhaps a trillion years?
So I ask Dr.
Dawkins:
1) How long could I leave the bacteria in the incubator before I
could reasonably infer that the cockroaches evolved from the bacteria
by random mutation and natural selection? Please provide me with the
experimental evidence (data and journal references) that you use to
arrive at your answer.
2) If you can’t tell me, then why isn’t Dr. Behe’s question- what are
the limits to what Darwinism can accomplish- a fair question?
The
New Gene Expression Theory
Genes
are activated or
deactivated throughout life and not
every gene is expressed in every cell.
Activated genes are expressed by being transcribed and
translated. All
genes are surrounded by DNA sequences that control their expression.
Proteins called transcription factors bind to these sequences and can
switch the genes on or off. Gene expression is therefore controlled by
the availability and activity of different transcription factors. As
transcription factors are proteins themselves, they must also be
produced by genes, and these genes must be regulated by other
transcription factors. Will the scientists ever explain, in godless
way, how the first genes could assemble without pre-existing genetic
material and how the further evolutes developed without highly
specified, pre-existing information? Till now all the answers are
speculatively theoretical without any laboratory experimental proof.
Science
Daily —
An international research consortium just published a set of papers
that promise to reshape our understanding of how the human genome
functions. The findings challenge the traditional view of our genetic
blueprint as a tidy collection of independent genes, pointing instead
to a complex network in which genes, along with regulatory elements and
other types of DNA sequences that do not code for proteins, interact in
overlapping ways not yet fully understood.

In
a group paper published in the June 14 issue of Nature and in 28
companion papers published in the June issue of Genome Research, the
ENCyclopedia Of DNA Elements (ENCODE) consortium, which is organized by
the National Human Genome Research Institute (NHGRI), part of the
National Institutes of Health (NIH), reported results of its
exhaustive, four-year effort to build a parts list of all biologically
functional elements in 1 percent of the human genome. Carried out by 35
groups from 80 organizations around the world, the research served as a
pilot to test the feasibility of a full-scale initiative to produce a
comprehensive catalog of all components of the human genome crucial for
biological function.
"This impressive effort
has uncovered many exciting
surprises and blazed the way for future efforts to explore the
functional landscape of the entire human genome," said NHGRI Director
Francis S. Collins, M.D., Ph.D. "Because of the hard work and keen
insights of the ENCODE consortium, the scientific community will need
to rethink some long-held views about what genes are and what they do,
as well as how the genome's functional elements have evolved. This
could have significant implications for efforts to identify the DNA
sequences involved in many human diseases."
The
completion of
the Human Genome Project in April 2003 was a major achievement, but the
sequencing of the genome marked just the first step toward the goal of
using such information to diagnose, treat and prevent disease. Having
the human genome sequence is similar to having all the pages of an
instruction manual needed to make the human body. Researchers still
must learn how to read the manual's language so they can identify every
part and understand how the parts work together to contribute to health
and disease.
In recent years,
researchers have made major strides in using DNA sequence data to
identify genes, which are traditionally defined as the parts of the
genome that code for proteins. The protein-coding component of these
genes makes up just a small fraction of the human genome -- 1.5 percent
to 2 percent. Evidence exists that other parts of the genome also have
important functions.
However, until now,
most studies have concentrated on functional elements associated with
specific genes and have not provided insights about functional elements
throughout the genome. The ENCODE project represents the first
systematic effort to determine where all types of functional elements
are located and how they are organized.
In the
pilot phase,
ENCODE researchers devised and tested high-throughput approaches for
identifying functional elements in the genome. Those elements included
genes that code for proteins; genes that do not code for proteins;
regulatory elements that control the transcription of genes; and
elements that maintain the structure of chromosomes and mediate the
dynamics of their replication.
The collaborative
study focused on 44 targets, which together cover about 1 percent of
the human genome sequence, or about 30 million DNA base pairs. The
targets were strategically selected to provide a representative cross
section of the entire human genome. All told, the ENCODE consortium
generated more than 200 datasets and analyzed more than 600 million
data points.
"Our results reveal
important principles about the organization of functional elements in
the human genome, providing new perspectives on everything from DNA
transcription to mammalian evolution. In particular, we gained
significant insight into DNA sequences that do not encode proteins,
which we knew very little about before," said Ewan Birney, Ph.D., head
of genome annotation at the European Molecular Biology Laboratory's
European Bioinformatics Institute (EBI) in Hinxton, England, who led
ENCODE's massive data integration and analysis effort.
The ENCODE consortium's major findings include the
discovery that the majority of DNA in the human genome is transcribed
into functional molecules, called RNA, and that these transcripts
extensively overlap one another. This broad pattern of transcription
challenges the long-standing view that the human genome consists of a
relatively small set of discrete genes, along with a vast amount of
so-called junk DNA that is not biologically active.
The new data
indicate the genome contains very little unused sequences and, in fact,
is a complex, interwoven network. In this network, genes are just one
of many types of DNA sequences that have a functional impact. "Our
perspective of transcription and genes may have to evolve," the
researchers state in their Nature paper, noting the network model of
the genome "poses some interesting mechanistic questions" that have yet
to be answered.
Other surprises in
the ENCODE data have major implications for our understanding of the
evolution of genomes, particularly mammalian genomes. Until recently,
researchers had thought that most of the DNA sequences important for
biological function would be in areas of the genome most subject to
evolutionary constraint -- that is, most likely to be conserved as
species evolve. However, the ENCODE effort found about half of
functional elements in the human genome do not appear to have been
obviously constrained during evolution, at least when examined by
current methods used by computational biologists.
According to ENCODE
researchers, this lack of evolutionary constraint may indicate that
many species' genomes contain a pool of functional elements, including
RNA transcripts, that provide no specific benefits in terms of survival
or reproduction. As this pool turns over during evolutionary time,
researchers speculate it may serve as a "warehouse for natural
selection" by acting as a source of functional elements unique to each
species and of elements that perform the similar functions among
species despite having sequences that appear dissimilar.
Other highlights of the ENCODE work include:
- Identification of numerous previously unrecognized
start sites for DNA
transcription.
- Evidence that, contrary to traditional views,
regulatory sequences are
just as likely to be located downstream of a transcription start site
on a DNA strand as upstream.
- Identification of
specific signatures of
change in histones, which are the proteins that organize DNA, and
correlation of these signatures with different genomic functions.
- Deeper understanding of how DNA replication is
coordinated by
modifications in histones.
"Teamwork was essential to the success of this effort.
No
single
experimental approach can be used to identify all functional elements
in the genome. So, it was necessary to conduct multiple, diverse
experiments and then analyze them using multiple computational
methods," said Elise A. Feingold, Ph.D., program director for ENCODE in
NHGRI's Division of Extramural Research, which provided most of the
funding for the pilot project.
Note:
This story has been adapted from a news
release issued by NIH/National Human Genome Research Institute.
Example
of Degeneration
The taxonomic relationship of mycoplasmas to other microbes
has been controversial (
Razin,
1992).
Prior to the 1930's, mycoplasmas were considered to be viruses because
they were so small that they passed through filters that blocked
passage of ordinary bacteria. Later they were thought to be symbionts
growing with the
Streptobacillus bacteria, and then
they were
proposed to be ordinary bacteria that had lost their cell wall (L form
bacteria). By the 1960's, both base composition and hybridization
analysis of the genomic DNA showed that mycoplasmas were not related to
stable L forms of ordinarily walled bacteria. However, current
explanations for the evolution of mycoplasmas argue for "
degenerative"
evolution from walled bacteria; thus the induction of L forms
may be a present-day recapitulation of one step in mycoplasma evolution.
QUOTES
Professor
Fred Alan Wolf:
I believe that the findings of quantum
physics increasingly support
Plato [who taught that there is a more perfect, non-material realm of
existence]. There is evidence that suggests the existence of a
non-material, non-physical universe that has a reality even though it
might not as yet be clearly perceptible to our senses and scientific
instrumentation. When we consider out-of-body experiences, shamanic
journeys and lucid dream states, though they cannot be replicated in
the true scientific sense, they also point to the existence of
non-material dimensions of reality. (1998:24)
Development of Novel Forms
Notable
differences in the developmental pathways of similar organisms have
been observed. For example, congeneric species of sea urchins (from
genus Heliocidaris) exhibit striking differences in
their
developmental pathways (Raff 1999:110-121). Thus, it might be argued
that such differences show that early developmental programs can in
fact be mutated to produce new forms. Nevertheless, there are two
problems with this claim. First, there is no direct evidence that
existing differences in sea urchin development arose by mutation.
Second, the observed differences in the developmental programs of
different species of sea urchins do not result in new body plans, but
instead in highly conserved structures. Despite differences in
developmental patterns, the endpoints are the same. Thus, even if it
can be assumed that mutations produced the differences in developmental
pathways, it must be acknowledged that such changes did not result in
novel form.
Degeneration
During
the 19th century--before Darwin's publications--scientists
considered the human race to be targeted by a process of degeneration
due to abandonment of the "natural" environment. Numerous physical and
behavioral signs and symptoms of degeneration were subsequently
described by anthropologists and by physicians in the dawn of a
scientific psychiatry. The degeneration hypothesis became so
influential, particularly in psychiatry, because it served as the first
causal explanation for almost all psychiatric disorders, as well as for
criminal behavior. Degeneration was also strongly associated with the
idea of the inheritance of acquired traits (Lamarckism), which was
still accepted in part in the beginning of the 20th century (see
overview in Hermle 1986). For example, the concept of germ lesion, or
"blastophthoria," was advocated by Emil Kraepelin (1908) as a model of
"inheritance" of various psychiatric disorders, including paralysis and
alcoholism. The scientific underpinnings, however, were rather vague,
and Lamarckism had been discarded, at least outside psychiatry.
(Ironically, the degeneration paradigm has recently resurfaced in the
concept of "anticipation," the increasingly earlier manifestation of
"triplet repeat" disorders in subsequent generations, which has been
demonstrated in a variety of autosomal dominant and X-chromosome-linked
neurological disorders, but not [yet] in psychiatric disorders [Spitzer
and Hermle 1995].)
The
Irony
Although
evolution theory is very
popular, still there is no complete explanation how it works and worked
at the biochemical level