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Theory of Intelligent Design, the best explanation of Origins » Theory of evolution » Genetic Phylogeny

Genetic Phylogeny

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1 Genetic Phylogeny on Sun Feb 16, 2014 1:33 pm

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Genetic Phylogeny

http://www.detectingdesign.com/geneticphylogeny.html

mollusks (scallops) are more closely related to deuterostomes (sea urchins) than arthropods (brine shrimp).  Of course, this is not too surprising.  Intuitively, a scallop seems more like a sea urchin than a shrimp.  So, the 82% correlation between the scallop and sea urchin is not surprising.  However, in this light it is surprising is that a tarantula (also an arthropod) has a 92% correlation with the scallop.  Here we have two different arthropods, a shrimp and an tarantula.  How can a scallop be much more related to one type of arthropod and much less related to the other type of arthropod? This troubling thought led the authors of the Science article to remark:

Different representative species, in this case brine shrimp or tarantula for the arthropods, yield wildly different inferred relationships among phyla. Both trees have strong bootstrap support (percentage at node). . .  The critical question is whether current models of 18S rRNA evolution are sufficiently accurate to successfully compensate for long branch attraction between the animal phyla. Without knowing the correct tree ahead of time, this question will be hard to answer. However, current models of DNA substitution usually fit the data poorly . . .

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