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The gut tube is formed from endoderm that migrates through the primitive streak. Before this, however, the anterior-posterior axis of the embryo is defined by the formation of the streak at the beginning of gastrulation. In mice, which are phylotypic with humans at this stage, the streak forms posteriorly and then extends to the anterior. I'm not sure if ...


Endless Form Most Beautiful: The New Science of Evo Devo introduces the reader to several classic embryology experiments and some key principles too. I'll edit this answer when I find more books or reading material of this nature.


Would you consider the New York Times a suitable level of detail (while admittedly not a book)? If so then you may want to peruse this collection: http://topics.nytimes.com/top/news/science/topics/biology_and_biochemistry/index.html You will have to be selective. This was my first hit in Google searching for 'lay articles on biochemistry.' I would ...


I think the Wikipedia entry on Colonies in biology is helpful. It writes: ...a colonial organism can be distinguished from a conventional multicellular organism by the looser association and repeating nature of its component subunits—perhaps with specializations, but still visibly similar. The components can also be recognized as organisms in ...

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