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David Dewitt
The >98.5% similarity has been misleading because it depends on what is being compared. There are a number of significant differences that are difficult to quantify. A review by Gagneux and Varki4 described a list of genetic differences between humans and the great apes. The differences include ‘cytogenetic differences, differences in the type and number of repetitive genomic DNA and transposable elements, abundance and distribution of endogenous retroviruses, the presence and extent of allelic polymorphisms, specific gene inactivation events, gene sequence differences, gene duplications, single nucleotide polymorphisms, gene expression differences, and messenger RNA splicing variations.’4
ReMine, The Biotic Message, page 449, calls into question the significance of DNA similarity:
There are two species of flies (Drosophila) that look alike but have only 25 percent of their DNA sequences in common. Yet the DNA of humans and chimpanzees share 97.5 percent. This means the DNA of two virtually identical flies is 30 times more different than that betweens humans and chimpanzees.
Dr. Mark Blais
Will evolutionists continue to adapt their beliefs further into fantasies of time and chance producing new species, while denying the amazing design of living creatures you and I observe today, and for what purpose?
Scientists, both creationists and evolutionists, are intrigued by the genetic information found in each species’ DNA; however, creationists have found the truth of the origins of species, genetic diversity, and design in all living things in the book of Genesis.
Shall the one who contends with the Almighty correct Him? He who rebukes God, let him answer it (Job 40:2).
answersinGenesis
Whatever else we might say about Tiktaalik, it is a fish. In a review article on Tiktaalik (appearing in the same issue of the scientific journal Nature that reported the discovery of Tiktaalik), fish evolution experts, Ahlberg and Clack concede that “in some respects Tiktaalik and Panderichthys are straightforward fishes: they have small pelvic fins, retain fin rays in their paired appendages and have well-developed gill arches, suggesting that both animals remained mostly aquatic.” 5
In other respects, however, Ahlberg and Clack argue that Tiktaalik is more tetrapod-like than Panderichthys because “the bony gill cover has disappeared, and the skull has a longer snout.” The authors weakly suggest that the significance of all this is that “a longer snout suggests a shift from sucking towards snapping up prey, whereas the loss of gill cover bones probably correlates with reduced water flow through the gill chamber. The ribs also seem larger in Tiktaalik, which may mean it was better able to support its body out of water.”
Without the author’s evolutionary bias, of course, there is no reason to assume that Tiktaalik was anything other than exclusively aquatic. And how do we know that Tiktaalik lost its gill cover as opposed to never having one? The longer snout and lack of bony gill covers (found in many other exclusively-aquatic living fish) are interpreted as indicating a reduced flow of water through the gills, which, in turn, is declared to be suggestive of partial air-breathing—but this is quite a stretch. Finally, what does any of this have to do with fish evolving into land dwelling tetrapods?
Are the pectoral fins of Tiktaalik really legs?
Before we get into Tiktaalik’s “legs,” it might be instructive to consider an old trick question. If we call our arms “legs,” then how many legs would we have? The answer, of course, is two legs—just because we call our arms “legs” doesn’t make them legs. The same might be said of the bony fins of Crossopterygian fish—we may call them “legs” but that doesn’t necessarily make them legs.
Shubin et al. make much of the claim that Tiktaalik’s bony fins show a reduction in dermal bone and an increase in endochondral bone.6 This is important to them because the limb bones of tetrapods are entirely endochondral. They further claim that the cleithrum (a dermal bone to which the pectoral fin is attached in fish) is detached from the skull, resembling the position of the scapula (shoulder blade) of a tetrapod. They also claim that the endochondral bones of the fin are more similar to those of a tetrapod in terms of structure and range of motion. However, none of this, if true, proves that Tiktaalik’s fins supported its weight out of water, or that it was capable of a true walking motion. (It certainly doesn’t prove that these fish evolved into tetrapods.)
Originally posted by Clearskies
For those who found anti-salvation in Tiktaalik;
It's just a fish, much like Archaeopteryx is just a bird.
Dr. Menton
The bony rays of fish fins are dermal bones that are not related in any way to digits in their structure, function or mode of development. Clearly, fin rays are relatively fragile and unsuitable for actual walking and weight bearing.