Wintery Knight

…integrating Christian faith and knowledge in the public square

Darwinists thought whale hips were accidents of evolution, then science happened

Another win for reason in the long war between science and naturalistic philosophy.

Science Daily reports.

Excerpt:

Both whales and dolphins have pelvic (hip) bones, evolutionary remnants from when their ancestors walked on land more than 40 million years ago. Common wisdom has long held that those bones are simply vestigial, slowly withering away like tailbones on humans.

New research from USC and the Natural History Museum of Los Angeles County (NHM) flies directly in the face of that assumption, finding that not only do those pelvic bones serve a purpose — but their size and possibly shape are influenced by the forces of sexual selection.

“Everyone’s always assumed that if you gave whales and dolphins a few more million years of evolution, the pelvic bones would disappear. But it appears that’s not the case,” said Matthew Dean, assistant professor at the USC Dornsife College of Letters, Arts and Sciences, and co-corresponding author of a paper on the research that was published online by Evolution on Sept. 3.

[...]“Our research really changes the way we think about the evolution of whale pelvic bones in particular, but more generally about structures we call ‘vestigial.’ As a parallel, we are now learning that our appendix is actually quite important in several immune processes, not a functionally useless structure,” Dean said.

This is not the first time this has happened – as they said, the appendix now has known functionality.

Flashback: ENCODE study falsifies Darwinian prediction that most of the genome is “Junk” DNA.

Filed under: Polemics, , , , , , ,

Convergence detected in the genetic structure of bats and dolphins

We have to start this post with the definition of convergence in biology.

In evolutionary biology, convergent evolution is the process whereby organisms not closely related (not monophyletic), independently evolve similar traits as a result of having to adapt to similar environments or ecological niches.

It is the opposite of divergent evolution, where related species evolve different traits.

On a molecular level, this can happen due to random mutation unrelated to adaptive changes; see long branch attraction. In cultural evolution, convergent evolution is the development of similar cultural adaptations to similar environmental conditions by different peoples with different ancestral cultures. An example of convergent evolution is the similar nature of the flight/wings of insects, birds, pterosaurs, and bats.

All four serve the same function and are similar in structure, but each evolved independently.

Jonathan Wells explains the problem that convergence poses for naturalistic evolution:

Human designers reuse designs that work well. Life forms also reuse certain structures (the camera eye, for example, appears in humans and octopuses). How well does this evidence support Darwinian evolution? Does it support intelligent design more strongly?

Evolutionary biologists attribute similar biological structures to either common descent or convergence. Structures are said to result from convergence if they evolved independently from distinct lines of organisms. Darwinian explanations of convergence strain credulity because they must account for how trial-and-error tinkering (natural selection acting on random variations) could produce strikingly similar structures in widely different organisms and environments. It’s one thing for evolution to explain similarity by common descent—the same structure is then just carried along in different lineages. It’s another to explain it as the result of blind tinkering that happened to hit on the same structure multiple times. Design proponents attribute such similar structures to common design (just as an engineer may use the same parts in different machines). If human designers frequently reuse successful designs, the designer of nature can surely do the same.

I’m a software engineer, and we re-use components all the time for different programs that have no “common ancestor”. E.g. – I can develop my String function library and use it in my web application and my Eclipse IDE plug-in, and those two Java programs have nothing in common. So you find the same bits in two different programs because I am the developer of both programs. But the two programs don’t extend from a common program that was used for some other purpose – they have no “common ancestor” program.

Now with that in mind, take a look at this recent article from Science Daily, which Mysterious Micah sent me.

Excerpt:

The evolution of similar traits in different species, a process known as convergent evolution, is widespread not only at the physical level, but also at the genetic level, according to new research led by scientists at Queen Mary University of London and published in Nature this week.

The scientists investigated the genomic basis for echolocation, one of the most well-known examples of convergent evolution to examine the frequency of the process at a genomic level.

Echolocation is a complex physical trait that involves the production, reception and auditory processing of ultrasonic pulses for detecting unseen obstacles or tracking down prey, and has evolved separately in different groups of bats and cetaceans (including dolphins).

The scientists carried out one of the largest genome-wide surveys of its type to discover the extent to which convergent evolution of a physical feature involves the same genes.

They compared genomic sequences of 22 mammals, including the genomes of bats and dolphins, which independently evolved echolocation, and found genetic signatures consistent with convergence in nearly 200 different genomic regions concentrated in several ‘hearing genes’.

[...]Consistent with an involvement in echolocation, signs of convergence among bats and the bottlenose dolphin were seen in many genes previously implicated in hearing or deafness.

“We had expected to find identical changes in maybe a dozen or so genes but to see nearly 200 is incredible,” explains Dr Joe Parker, from Queen Mary’s School of Biological and Chemical Sciences and first author on the paper.

“We know natural selection is a potent driver of gene sequence evolution, but identifying so many examples where it produces nearly identical results in the genetic sequences of totally unrelated animals is astonishing.”

Nature is the most prestigious peer-reviewed science journal. This is solid material.

There is an earlier article from 2010 in New Scientist that talked about one of the previous genes that matched for hearing capability.

Excerpt:

Bats and dolphins trod an identical genetic path to evolve a vital component of the complex sonar systems they use to pursue and catch prey.

The finding is unusual, because although many creatures have independently evolved characteristics such as eyes, tusks or wings, they usually took diverse genetic routes to get there.

Analysis of a specific gene has now demonstrated that although bats live in air and dolphins in water, where sound travels five times faster, they independently evolved a near-identical gene that allows them to accept high-frequency sound in the ear – vital for sonar.

The gene makes prestin, a protein in hair cells of the cochlea, which is the organ in the inner ear where sonar signals are accepted and amplified. Prestin changes shape when exposed to high-frequency sound, and this in turn deforms the fine hair cells, setting off an electrical impulse to the brain. So the protein has the important jobs of detecting and selecting high-frequency sounds for amplification.

When researchers examined the molecular structure of the prestin gene from a range of animals, they found that the variants in echolocating bats and dolphins were virtually indistinguishable.

Indistinguishable genes in animals that don’t share a common ancestor? Maybe a better explanation for the evidence we have is – common designer.

Filed under: News, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

Jonathan M. reviews Jerry Coyne’s pro-evolution book

Jonathan M. is breaking it down chapter by chapter at Evolution News. Chapter 2 is on fossils. In his response to chapter 2, he covers fish/amphibian evolution, bird/dinosaur evolution and whale evolution.

Here’s a snippet about the whale series:

The next transitional series alluded to by Coyne is the whale series. One of the most notable problems with the evolution of the whale is the extremely abrupt timescale over which it is supposed to have occurred. The sheer force of this conundrum is only properly appreciated when one considers the multiple feats of anatomical novelty, innovative engineering and genetic rewiring necessary to change a terrestrial mammal like Pakicetus into a fully aquatic whale. Indeed, evolutionary biologist Richard Sternberg has argued that even many of the relatively minor changes are extremely unlikely to have occurred in the time-frame allowed. Consider the following small sample of necessary modifications:

  • Counter-current heat exchanger for intra-abdominal testes
  • Ball vertebra
  • Tail flukes and musculature
  • Blubber for temperature insulation
  • Ability to drink sea water (reorganization of kidney tissues)
  • Fetus in breech position (for labor underwater)
  • Nurse young underwater (modified mammae)
  • Forelimbs transformed into flippers
  • Reduction of hindlimbs
  • Reduction/loss of pelvis and sacral vertebrae
  • Reorganization of the musculature for the reproductive organs
  • Hydrodynamic properties of the skin
  • Special lung surfactants
  • Novel muscle systems for the blowhole
  • Modification of the teeth
  • Modification of the eye for underwater vision
  • Emergence and expansion of the mandibular fat pad with complex lipid distribution
  • Reorganization of skull bones and musculature
  • Modification of the ear bones
  • Decoupling of esophagus and trachea
  • Synthesis and metabolism of isovaleric acid (toxic to terrestrial mammals)
  • Emergence of blowhole musculature and their neurological control

According to Richard Sternberg’s calculations, and based on the equations of population genetics applied in a 2008 paper by Durrett and Schmidt in the Journal of Genetics, one may reasonably expect to see two coordinated mutations achieve fixation in the timeframe of around 43.3 million years. When one considers the magnitude of the engineering feat, such a scenario can only be ruled incredible. The problem is accentuated further when one considers that the majority of anatomical novelties unique to aquatic cetaceans (Pelagiceti) appeared during just a few million years — probably within 1-3 million years.

[...]More recently, however, a jawbone was discovered that belonged to a fully aquatic whale dating to 49 million years ago, only four million years afterPakicetus! This means that the first fully aquatic whales now date to around the time when walking whales (Ambulocetus) first appear. This substantially reduces the time window — to 4 or 5 million years, perhaps even less — that may be allotted to the Darwinian mechanism to accomplish truly radical engineering innovations and genetic rewiring. It also suggests that this fully aquatic whale existed before its previously presumed semi-aquatic archaeocetid ancestors.

If you missed chapter 1, it’s here. And chapter 3 is out soon.

Filed under: News, , , , , , , , , , , , ,

Friday night movie: Moby Dick (1956)

Here’s tonight’s movie:

IMDB rating: [7.4/10]

Description:

This classic story by Herman Melville revolves around Captain Ahab and his obsession with a huge whale, Moby Dick. The whale caused the loss of Ahab’s leg years before, leaving Ahab to stomp the boards of his ship on a peg leg. Ahab is so crazed by his desire to kill the whale, that he is prepared to sacrifice everything, including his life, the lives of his crew members, and even his ship to find and destroy his nemesis, Moby Dick.

If you’re interested in reading about the real Ahab in the Bible, you can find it in 1 Kings 16:29 to 1 Kings 20:43.

Happy Friday!

Related posts

Filed under: Videos, , , , , , , , , , , ,

Science Daily reports on genetic convergence in bats and whales

We have to start this post with the definition of convergence in biology.

In evolutionary biology, convergent evolution is the process whereby organisms not closely related (not monophyletic), independently evolve similar traits as a result of having to adapt to similar environments or ecological niches.

It is the opposite of divergent evolution, where related species evolve different traits.

On a molecular level, this can happen due to random mutation unrelated to adaptive changes; see long branch attraction. In cultural evolution, convergent evolution is the development of similar cultural adaptations to similar environmental conditions by different peoples with different ancestral cultures. An example of convergent evolution is the similar nature of the flight/wings of insects, birds, pterosaurs, and bats.

All four serve the same function and are similar in structure, but each evolved independently.

Jonathan Wells explains the problem that convergence poses for naturalistic evolution:

Human designers reuse designs that work well. Life forms also reuse certain structures (the camera eye, for example, appears in humans and octopuses). How well does this evidence support Darwinian evolution? Does it support intelligent design more strongly?

Evolutionary biologists attribute similar biological structures to either common descent or convergence. Structures are said to result from convergence if they evolved independently from distinct lines of organisms. Darwinian explanations of convergence strain credulity because they must account for how trial-and-error tinkering (natural selection acting on random variations) could produce strikingly similar structures in widely different organisms and environments. It’s one thing for evolution to explain similarity by common descent—the same structure is then just carried along in different lineages. It’s another to explain it as the result of blind tinkering that happened to hit on the same structure multiple times. Design proponents attribute such similar structures to common design (just as an engineer may use the same parts in different machines). If human designers frequently reuse successful designs, the designer of nature can surely do the same.

I’m a software engineer, and we re-use components all the time for different programs that have no “common ancestor”. E.g. – I can dump develop my String function library and use it in my web application and my Eclipse IDE plug-in, and those two Java programs have nothing in common. So you find the same bits in two different programs because I am the developer of both programs. But the two programs don’t extend from a common program that was used for some other purpose – they have no “common ancestor” program.

Now with that in mind, take a look at this post from Evolution News.

Excerpt:

Earlier this year I wrote about how convergent genetic evolution is highly unlikely under neo-Darwinism, but makes perfect sense if you allow common design. An article in ScienceDaily titled “In Bats and Whales, Convergence in Echolocation Ability Runs Deep,” points to evidence that, in my opinion, might be best explained by common design.

According to the standard mammalian phylogeny, the common ancestor of bats and whales was not capable of echolocation. Thus, the ability to echolocate must have evolved independently, and bat and whale echolocation is often cited by evolutionists as a textbook example of convergent evolution. However, the ScienceDaily article reports that these similarities are not just phenotypic but extend down into the level of the gene sequences:

two new studies in the January 26th issue of Current Biology, a Cell Press publication, show that bats’ and whales’ remarkable ability and the high-frequency hearing it depends on are shared at a much deeper level than anyone would have anticipated — all the way down to the molecular level

Just as I noted that convergent genetic evolution was said to be “surprising” under neo-Darwinian thinking, this article reports, “The discovery represents an unprecedented example of adaptive sequence convergence between two highly divergent groups and suggests that such convergence at the sequence level might be more common than scientists had suspected.”

The typical Darwinist tack is to call similar structures “superficially similar”. I.e. – the appearance (phenotypes) are similar, but at the genotype (code) level, there is nothing in common. They have to say that because there is no common ancestor who shares the structure, so the biological information CANNOT be similar. A naturalistic theory can’t accommodate similarities at the genetic level unless there is a shared common ancestor who has those instructions. But guess what? When you actually take a closer look at the evidence… the biological information IS similar between bats and whales – AND THEY DON’T SHARE A COMMON ANCESTOR. So it exactly like the software design scenario, where the designer has put the same bits into two programs that were developed independently and don’t extend from a common program.

The Science Daily article explains more:

“The natural world is full of examples of species that have evolved similar characteristics independently, such as the tusks of elephants and walruses,” said Stephen Rossiter of the University of London, an author on one of the studies. “However, it is generally assumed that most of these so-called convergent traits have arisen by different genes or different mutations. Our study shows that a complex trait — echolocation — has in fact evolved by identical genetic changes in bats and dolphins.”

[...]“We were surprised by the strength of support for convergence between these two groups of mammals and, related to this, by the sheer number of convergent changes in the coding DNA that we found,” Rossiter said.

Read the whole thing at Evolution News. This is quality work by Casey Luskin.

Filed under: News, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

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