Given its widespread popularity and acceptance you might not have realized that the so-called RNA World hypothesis suffers from some dramatic problems.
In order for evolution to have occurred as the orthodox theory describes, the intricate embryonic development stages of species must have evolved.
Yesterday we saw how, in a new paper, Warren Allmon and Robert Ross reformulate the argument for evolution from homologous structures.
The paper contains a very important concession.
The claim that they found that the expression of dorsoventral transcription factors evolved independently in certain bilaterian lineages is not even wrong.