Chapter 12 Chapter Outline

Birds and Mammals

Early Development in Birds

  • Avian Cleavage
  • Gastrulation of the avian embryo
  • Axis specification and the avian “organizer”
  • Left-right axis formation

Early Development in Mammals

  • Mammalian cleavage
  • Trophoblast or ICM? The first decision of the rest of your life
  • Mammalian gastrulation
  • Mammalian axis formation
  • Twins

Coda 

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