| Front | The 4 major works in discovering the control of embryonic development |
|---|---|
| Back | 1) Roux Weismann Hypothesis 2) Hans Driesch's Experiment on sea urchin: (mechanically shook apart the 2 celled embryo) 3) Hans Spemann's Experiment on salamander zygote: (constricted the zygote with hair & allowed nuclear flow after 16 cell stage) 4) *Hilde Mangold* & Hans Spemann's Experiment on salamander gastrula |
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