Practice question

After observing isolated blastomeres each forming complete diminutive pluteus larvae, Hans Driesch reasoned sea urchin embryo is not mosaic of self-differentiating preformed parts but regulative dynamic system where each cell potential remains equipotential and final fate emerges from interactions within whole community. He coined term harmonious equipotential system, meaning entire embryo harmonizes to produce normal pattern regardless of part removal or recombination, exhibiting regulation. This concept encapsulated regulative development, conditional specification, and embryonic field ideas, directly opposing Roux's mosaic autonomous model proposed from frog experiments and heavily influencing modern systems biology and developmental genetics.