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Biology 39.4
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Biology 39.4

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  • 1. 39.4 Fertilization and Development
  • 2. Zygote
    Fertilized Egg.
  • 3. Implantation
    Process in which a blastocyst attaches itself to the wall of the uterus.
  • 4. Differentiation
    Process in which cells become specialized in structure and function.
  • 5. Gastrulation
    Process of cell migration by which a third layer of cells is formed within the cavity of a blastocyst.
  • 6. Neurulation
    Development of the nervous system.
  • 7. Placenta
    Organ in placental mammals through which nutrients, oxygen, carbon dioxide, and wastes are exchanged between embryo and mother.
  • 8. Fetus
    Name given to a human embryo after eight weeks of development.
  • 9. Key Concept
    The process of a sperm joining an egg is called fertilization.
  • 10. Key Concept
    The stages of early development include implantation, gastrulation, and neurulation.
  • 11. Key Concept
    The placenta is the embryo’s organ of respiration, nourishment, and excretion.

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