Principles of Development Chapter 8. Early Concepts: Preformation vs Epigenesis The question of how a zygote becomes an animal has been asked for centuries.
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GENERAL EMBRYOLOGY 1. Development of embryology 2. Germ cell and fertilization 3. Blastocyst and implantation 4. Formation of the germ layer 5. Differentiation.
Principles of Development Chapter 8. Key Events in Development Development describes the changes in an organism from its earliest beginnings through maturity.
