I am just blown away by the consistency of this observation. You know, the creationists are not all stupid; there’s a wide range of intelligence in their camp, even if they are all wrong. But this one recent paper on the gorilla genome has become such an excellent tool for discriminating the competent from the incompetent.
This was the paper that unsurprisingly explained that gorilla genes reveal a mosaic; that some gorilla genes are closer to human or chimpanzee than the latter are to each other. If you understand the logic of coalescent theory at all, you know this is an expected result. The only way you could fail to see the distribution we observe is if the population went through a bottleneck of exactly two individuals.
But once again, one of the so-called scientists of intelligent design creationism blows it. Doug Axe has announced that the ape family tree is hopelessly broken, and that the gorilla data should call evolutionary theory into question.
Until recently, the answer was that a real family tree should generate a fully consistent pattern of similarities. [Not true at all. Coalescent theory is an extension of Fisher/Wright models of large populations, and the formal mathematics were worked out in the 1980s] For example, we are told that chimps and humans came from the same ancestral stock (call it CH stock) and that gorillas, chimps and humans all came from an earlier ancestral stock (GCH stock) [Correct so far]. If so, then the human and chimp genomes should consistently be more similar to each other than either is to the gorilla genome [WRONG. They should not be consistently more similar. Does he know nothing of probability?], since the human and chimp histories were one and the same thing more recently than the human and gorilla (or chimp and gorilla) histories were.
Well, the recent publication of the gorilla genome sequence shows that the expected pattern just isn’t there [Jebus. Read the paper. The pattern observed is the expected pattern.]. Instead of a nested hierarchy of similarities, we see something more like a mosaic [AS WE’D EXPECT.]. According to a recent report, “In 30% of the genome, gorilla is closer to human or chimpanzee than the latter are to each other…”
That’s sufficiently difficult to square with Darwin’s tree that it ought to bring the whole theory into question. And in an ideal world where Darwinism is examined the way scientific theories ought to be examined, I think it would. But in the real world things aren’t always so simple [And yet the creationists keep throwing up their simplistic models and being surprised that they’re wrong].
Axe is the one guy the creationists keep touting as a real scientist, a guy with genuine chops in molecular biology, the man who is doing serious scientific work. You know, if you’re going to publicly criticize an observation and claim it calls into question the entirety of evolutionary theory, you ought to first look into it and see whether that observation actually fits a prediction of evolution — actual evolutionary theory, not that cartoonishly naive caricature of evolution the creationists all have in their heads.
Here’s a nice, short history of coalescent theory by Kingman. It’s been around for decades, long before the gorilla genome was sequenced, and it predicted what kinds of distributions we ought to see in our comparisons of different species…predictions that were borne out by the paper Axe thinks contradicts evolutionary theory.