Tag Archives: Genome

News

Do non-coding segments of the genome provide evidence for common ancestry?

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From Evolution News.

Excerpt:

Darwin’s tree of life might be visible in DNA, if DNA didn’t conspire to scramble the signal.

Now that quite a few genomes have been published, a team from Australia and France went on a Darwin fishing trip in the gene pool. In the largest study of its kind to date, they examined microsatellite markers (tandem-repeated DNA motifs of 1-6 base pairs) that are widespread in eukaryotic genomes. If neo-Darwinism is correct, these non-coding stretches of DNA should reflect the tree of common ancestry by showing similar mutational patterns in related groups.

Well, they don’t. The paper by Meglecz, Neve, Biffin and Gardner in PLoS ONE is titled, “Breakdown of Phylogenetic Signal: A Survey of Microsatellite Densities in 454 Shotgun Sequences from 154 Non Model Eukaryote Species.” What went wrong?

As the title implies, the team checked 154 “non-model” species. Darwinian evolutionists tend to focus on the model species, like a particular roundworm, the fruit fly Drosophila melanogaster, and a species of watercress, because their genomes are complete and most researchers use them in experiments. Problem: they may or may not be representative:

Although information for model species is accumulating rapidly, it is insufficient due to a lack of species depth, thus intragroup variation is necessarily ignored. As such, apparent differences between groups may be overinflated and generalizations cannot be inferred until an analysis of the variation that exists within groupshas been conducted. In this study, we examined microsatellite coverage and motif patterns from 454 shotgun sequences of 154 Eukaryote species from eight distantly related phyla (Cnidaria, Arthropoda, Onychophora, Bryozoa, Mollusca, Echinodermata, Chordata and Streptophyta) to test if a consistent phylogenetic pattern emerges from the microsatellite composition of these species.

Sounds like a good test. After all, scientists shouldn’t generalize on overinflated signals, right? The team expected to find nicely behaved data interpolated between the model species. It wasn’t to be:

It is clear from our results that data from model species provide incomplete information regarding the existing microsatellite variability within the Eukaryotes. A very strong heterogeneity of microsatellite composition was found within most phyla, classes and even orders. Autocorrelation analyses indicated that while microsatellite contents of species within clades more recent than 200 Mya tend to be similar, the autocorrelation breaks down and becomes negative or non-significant with increasing divergence time. Therefore, the age of the taxon seems to be a primary factor in degrading the phylogenetic pattern present among related groups. The most recent classes or orders of Chordates still retain the pattern of their common ancestor. However, within older groups, such as classes of Arthropods, the phylogenetic pattern has been scrambled by the long independent evolution of the lineages.

There are two ways to interpret this anomaly. One is that microsatellites mutate too fast to maintain the phylogenetic signal. (This is known as a “post hoc rationalization.”)

The other is that Darwin was wrong. Data do not show a phylogenetic pattern; they show common design with some variation.

Read the rest here. I’m a skeptic on common ancestry, but not for religious reasons. I just don’t think that it’s compatible with the progress of science.

News

New study: Gorilla genome calls common ancestry thesis into question

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ECM sent me this must-read article from Evolution News.

Excerpt:

A whopping 30% of the gorilla genome — amounting to hundreds of millions of base pairs of gorilla DNA — contradicts the standard supposed evolutionary phylogeny of great apes and humans. That’s the big news revealed last week with the publication of the sequence of the full gorilla genome.

[…]The standard evolutionary phylogeny of primates holds that humans and chimps are more closely related to one-another than to other great apes like gorillas. In practice, all that really means is that when we sequence human, chimp, and gorilla genes, human and chimp genes have a DNA sequence that is more similar to one-another’s genes than to the gorilla’s genes. But huge portions of the gorilla genome contradict that nice, neat tidy phylogeny. That’s because these gorilla genes are more similar to the human or chimp version than the human or chimp versions are to one-another. In fact, it seems that some 30% of the gorilla genome contradicts the standard primate phylogeny in this manner.

[…]The bottom line is that the gorilla genome has confirmed that there is not a consistent story of common ancestry coming from the genomes of the great apes and humans. Hundreds of millions of base pairs in the gorilla genome conflict with the supposed phylogeny of great apes and humans. They might think their explanation salvages common ancestry, but clearly the gorilla genome data badly messes up the supposedly nice, neat, tidy arguments which they use to claim humans are related to the great-apes.

Read the whole thing to see how the Darwinists wiggle and squirm to avoid the implications of the data.

We have to form our beliefs about origins based on scientific evidence, not based on philosophical assumptions. It does not good at all to assume materialism and then determine in advance that some sort of physical process must be responsible for the diversity of life. We have to eschew philosophical assumptions and led the scientific experiments determine our conclusions. Experiments are good, naturalistic religious dogma is bad.

Polemics

Paul Copan challenges Richard Dawkins on determinism and rationality

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This is from Parchment & Pen. There is an MP3 file linked in the post. (H/T Apologetics 315)

Excerpt:

Last week, Richard Dawkins spoke here in Ft. Lauderdale at Nova Southeastern University on “The Fact of Evolution.” The following week, I spoke on “The Fact of God”—also delivered at Nova Southeastern.

[…]I asked Dawkins how he could claim that the naturalist id rationally superior to the theist since, according to his book River Out of Eden, all of us are dancing to the music of our DNA. Our beliefs are the product of non-rational, deterministic physical forces beyond our control—whether we’re theists or naturalists. In fact, if the naturalist is right, it’s only by accident—not because he’s more intellectually virtuous than the theist. That is, the naturalist has accidental true belief (which is not knowledge) rather than warranted true belief (which is knowledge).

Dawkins gave the odd reply that it’s kind of like Republicans and Democrats—with each group thinking they’re right and the other group wrong. But on what grounds could either side think they are more rational than the other? Dawkins then added that he supposed that whatever view “works” the correct one to hold. But here’s the problem: what “works” is logically distinct from “true” or “matching up with reality”—since we may hold to a lot of false beliefs that help us survive and reproduce, even if they are false. Indeed, naturalistic evolution is interested in survival and reproduction—the “four F’s” (fighting, feeding, fleeing, and reproducing). Truth, the naturalist philosopher Patricia Churchland argues, is secondary to these pursuits According to another such naturalist, the late Richard Rorty, truth is “utterly unDarwinian.”

[…]…how can Dawkins condemn “religious” people who fly planes into buildings since they are just dancing to their DNA—just like the naturalist is? They’re just doing what nature has programed them to do. We can further ask: Why isn’t Dawkins denouncing atrocities done in the name of atheism—like those of Stalin, Pol Pot, or Mao Tse-tung? Dawkins gives the impression that it’s only people of “religion” who carry out horrendous evils. Of course, if Dawkins is right, these mass murderers could not justly be condemned since they too were wired by nature to act as they did.

Paul then excerpts a segment from an interview with Dawkins:

Dawkins:….What I do know is that what it feels like to me, and I think to all of us, we don’t feel determined. We feel like blaming people for what they do or giving people the credit for what they do. We feel like admiring people for what they do. None of us ever actually as a matter of fact says, “Oh well he couldn’t help doing it, he was determined by his molecules.” Maybe we should… I sometimes… Um… You probably remember many of you would have seen Fawlty Towers. The episode where Basil where his car won’t start and he gives it fair warning, counts up to three, and then gets out of the car and picks up a tree branch and thrashes it within an edge of his life. Maybe that’s what we all ought to… Maybe the way we laugh at Basil Fawlty, we ought to laugh in the same way at people who blame humans. I mean when we punish people for doing the most horrible murders, maybe the attitude we should take is “Oh they were just determined by their molecules.” It’s stupid to punish them. What we should do is say “This unit has a faulty motherboard which needs to be replaced.” I can’t bring myself to do that. I actually do respond in an emotional way and I blame people, I give people credit, or I might be more charitable and say this individual who has committed murders or child abuse of whatever it is was really abused in his own childhood. ….

Manzari: But do you personally see that as an inconsistency in your views?

Dawkins: I sort of do. Yes. But it is an inconsistency that we sort of have to live with otherwise life would be intolerable. But it has nothing to do with my views on religion it is an entirely separate issue.

There’s a fuller explanation in the post – I just pulled out some parts to give you the idea.

This is something Christians need to get used to. Atheism should not smuggle in Christian beliefs. Atheism has to stand and fall on materialism, determinism, life ending at the grave, and moral subjectivism. There is no free will on atheism. There are no moral values or moral obligations on atheism. There is no rationality on atheism. There is no meaning in life on atheism. There is no purpose to life on atheism. There is no accountability for sin on atheism. There is no self-sacrificial love on atheism. There is no reward for virtue and self-sacrifice on atheism. It is a worldview