Science article acknowledges convergent similarity is contrary to Darwinian expectations


Article reads: This poses a real problem for Darwinian evolution because it means that on the one hand a trait appears to be entirely convergent, but on the other hand virtually identical genetic mechanisms are being used to generate the trait. They call it “deep homology” because it’s extremely unlikely that such a high degree of genetic similarity would appear by chance. Since they are inextricably wedded to material causes, they conclude that the similarity must exist due to common ancestry. However, the traits also cannot possibly be entirely homologous since the traits produced by the genes are not found in the common ancestor. Either way, this data shows that at some level, extremely high patterns of biological similarity appeared independently.

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