Introduction to Early Embryonic Development

Explain how the embryo forms from the zygote

After an egg is fertilized, and has fused with sperm to form a zygote, an embryo begins to develop. The process in which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well-regulated. The early stages of embryonic development are also crucial for ensuring the fitness of the organism.

What You’ll Learn to Do

  • Discuss the role of cleavage in animal development
  • Discuss the role of gastrulation in animal development
  • Describe the process of organogenesis
  • Identify the anatomical axes formed in vertebrates

Learning Activities

The learning activities for this section include the following:

  • Cleavage and Blastula Stage
  • Gastrulation
  • Organogenesis
  • Vertebrate Formation
  • Self Check: Early Embryonic Development