Molecular Biology Of The Cell 6th Edition by Bruce Alberts, Alexander Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter

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0 Morphogens play a key role in development, cre- ating concentration gradients that inform cells of where they are and how to behave. Examine the simple patterns represented by the flags in Figure Q21-1. Which do you suppose could be created by a gradient of a single mor- phogen? Which would require gradients of two morpho- gens? Assuming that such patterns were present in a sheet of cells, explain how they could be created by morphogens.