Paleobiology / Evolutionary Biology

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Conversely, some researchers argue that the explosion was not merely environmental but genetic. They point to the evolution of Hox genes—regulatory genes that dictate the body plan of an embryo. A mutation allowing for greater segmentation or the duplication of these genes could have provided a "developmental toolkit" that enabled rapid morphological experimentation. According to this view, the explosion was an internal biological innovation that happened to coincide with favorable external conditions.

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