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In an attempt to contradict the theory of evolution, creationist claim to repute the Dino-Birds relations.
The first piece of evidence against evolution is the old avian digit problem. Birds couldn’t have evolved from dinosaurs, because they have the wrong finger order!
The answer is that there are two developmental processes going on. The first is the formation of the condensations, CI through CV. This process partitions the terminal region into an appropriate number of chunks, but doesn’t actually specify the identity of the digits. The second process takes each of those chunks and assigns a digit identity to them, and this process is to some degree independent of the first and uses a different set of signals. Wolpert et al. have noticed this in modern embryos:
Go here for the full explanation. It is an interesting one.
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