Assess students' ability to formulate, nondimensionalize, and implement reaction–diffusion models to simulate morphogen gradient formation in tissues. Tasks include deriving PDEs with production, diffusion, and degradation terms; choosing boundary/initial conditions; selecting and justifying a numerical scheme with stability considerations; estimating key length/time scales and nondimensional parameters; running simulations to obtain steady-state gradients and quantifying gradient shape and robustness; and interpreting how parameter changes or noise affect patterning and experimental readouts. Students should critique model assumptions and propose approaches for parameter estimation and experimental validation.