Developmental Biology

The measure of the ability of a population to produce the same phenotype regardless of variability of its environment or genotype.

The spatial distribution of a morphogen concentration determines the pattern of development in a tissue.

Ontogeny recapitulates phylogeny; the development of an organism (ontogeny) expresses all the intermediate forms of its ancestors throughout evolution (phylogeny).

A conceptual definition of a morphogen, describing how a gradient of a single substance can determine different cell fates based on concentration thresholds.