It undergoes a change toward a more specialized form or function.
  • What happens to a cell during the process of differentiation?
  • What are the three germ layers contained in the gastrula?
  • What is the formation of a fertilization envelope that bars additional sperm from entry into the egg?
  • The _____ eventually develops into the sea urchin's digestive tract.
Cortical Reaction
  • An ectodermal thickening above the frog's notochord forms a _____ _____.
  • The posterior portion of the neural tube will develop into the frog's _____ _____.
  • What is the formation of a fertilization envelope that bars additional sperm from entry into the egg?
  • What are the three germ layers contained in the gastrula?
Zygote
  • The notochord functions as a core around which mesodermal cells form the frog's _____.
  • The _____ eventually develops into the sea urchin's digestive tract.
  • In sea urchins, the process of fertilization produces a(n) _____.
  • In vertebrates, the ectoderm gives rise to the ______ layer of the skin.
Ectoderm
  • During gastrulation in frogs, a rod of mesoderm under the dorsal surface forms the _____.
  • During gastrulation, invagination occurs at the _____.
  • During gastrulation in frogs, cells from the animal pole spread over the embryo and form the _____.
  • The notochord functions as a core around which mesodermal cells form the frog's _____.
Spinal Chord
  • The notochord functions as a core around which mesodermal cells form the frog's _____.
  • During gastrulation in frogs, a rod of mesoderm under the dorsal surface forms the _____.
  • An ectodermal thickening above the frog's notochord forms a _____ _____.
  • The posterior portion of the neural tube will develop into the frog's _____ _____.
Neural Tube
  • An ectodermal thickening above the frog's notochord forms a _____ _____.
  • The _____ _____ is(are) formed when the neural folds join and a portion of the neural plate sinks beneath the embryo's surface.
  • The _____ eventually develops into the sea urchin's digestive tract.
  • The posterior portion of the neural tube will develop into the frog's _____ _____.
Neural Plate
  • An ectodermal thickening above the frog's notochord forms a _____ _____.
  • In vertebrates, the ectoderm gives rise to the ______ layer of the skin.
  • The posterior portion of the neural tube will develop into the frog's _____ _____.
  • The _____ _____ is(are) formed when the neural folds join and a portion of the neural plate sinks beneath the embryo's surface.
Brain
  • The notochord functions as a core around which mesodermal cells form the frog's _____.
  • As cleavage continues, a zygote forms into a solid multicellular ball called a(n) _____.
  • The posterior portion of the neural tube will develop into the frog's _____ _____.
  • The enlarged anterior portion of the neural tube will develop into a frog's _____.
Blastula
  • During gastrulation, invagination occurs at the _____.
  • Several hours after fertilization, cleavage results in the formation of a hollow ball of cells called a _____.
  • The notochord functions as a core around which mesodermal cells form the frog's _____.
  • As cleavage continues, a zygote forms into a solid multicellular ball called a(n) _____.
Notochord
  • During gastrulation in frogs, cells from the animal pole spread over the embryo and form the _____.
  • During gastrulation in frogs, a rod of mesoderm under the dorsal surface forms the _____.
  • The posterior portion of the neural tube will develop into the frog's _____ _____.
  • During gastrulation, invagination occurs at the _____.
Blastomeres
  • What are the three germ layers contained in the gastrula?
  • During gastrulation, invagination occurs at the _____.
  • Endoderm formation
  • What are the cells created by cleavage called?
Outer
  • In sea urchins, the process of fertilization produces a(n) _____.
  • An ectodermal thickening above the frog's notochord forms a _____ _____.
  • As cleavage continues, a zygote forms into a solid multicellular ball called a(n) _____.
  • In vertebrates, the ectoderm gives rise to the ______ layer of the skin.
Archenteron
  • The _____ _____ is(are) formed when the neural folds join and a portion of the neural plate sinks beneath the embryo's surface.
  • The notochord functions as a core around which mesodermal cells form the frog's _____.
  • The _____ eventually develops into the sea urchin's digestive tract.
  • The posterior portion of the neural tube will develop into the frog's _____ _____.
True or false? Early animal development progresses through distinct stages: first the production of the zygote through fertilization, then cleavage, then the formation of the gastrula, and then the formation of the blastula.
  • True
  • False
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