Etymology: L, regula, rule
a type of embryonic development in which the fertilized ovum undergoes indeterminate cleavage, producing blastomeres that have similar developmental potencies and are each capable of giving rise to a single embryo. Determination of the particular organs and parts of the embryo occurs during later stages of development and is influenced by inductors and intercellular interaction. Damage or destruction of various cells during the early stages of development results in readjustments and substitutions so that a normal organism is formed. Compare mosaic development.