Morphogenetic field

A morphogenetic field is a region of embryonic tissue within which cells acquire a common developmental fate through their position relative to signaling sources. It is not a physical boundary but a dynamical attractor: a self-organizing pattern of gene expression and cell behavior that emerges from local interactions between morphogen gradients and cellular response thresholds. The field concept, developed by Ross Harrison and extended by C.H. Waddington, challenges the gene-centric view by locating the causal power of development in the tissue-level organization rather than in individual genetic instructions. Evolution modifies form not by redesigning genes but by reshaping the geometry, timing, and boundary conditions of these fields.