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Chapter 15 - Differentiation and the Evolution of DevelopmentThe diversity of life on Earth has been the product of evolution. Humans, flies, and worms have, at some point in distant time, a common ancestry. None of these three modern organisms looks at all like the other; probably their common ancestor had just as dissimilar an appearance. None-the-less, powerful new evidence is emerging that despite great variety of form, there are common pathways and means of development. In other realms, bacteria and viruses, much earlier divergents from life’s “stream” have their own developmental plans. Developmental Biology is one of the most active and exciting fields of investigation. Its results are providing new information about evolution and its probable history.
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