Embryology: Developmental Stages
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Questions and Answers

What are the three tissue layers present in bilaterians?

  • Ectoderm, endoderm, and mesoderm (correct)
  • Ectoderm, mesoderm, and endodermic
  • Endoderm, ectoderm, and mesenchyme
  • Mesoderm, endoderm, and ectodermic
  • What is the term for the study of the development of the zygote?

  • Developmental biology
  • Embryology (correct)
  • Germ layer formation
  • Embryogenesis
  • What is the stage of development where each cell division produces smaller cells that then form a cavity?

  • Morula
  • Gastrula
  • Blastula (correct)
  • Cleavage
  • Which type of embryonic development is characterized by determinate cleavage?

    <p>Protostomes</p> Signup and view all the answers

    What is the term for the body cavity found in some animals?

    <p>Coelom</p> Signup and view all the answers

    Which group of animals is characterized by the presence of a mesoglea?

    <p>Cnidarians</p> Signup and view all the answers

    What is the term for the process by which the gastrula stage develops into a more complex body structure?

    <p>Gastrulation</p> Signup and view all the answers

    Which group of animals is characterized by the absence of a gut?

    <p>Platyhelminthes</p> Signup and view all the answers

    What is the term for the process of cell division that occurs during early embryonic development?

    <p>Cleavage</p> Signup and view all the answers

    Which type of embryonic development is characterized by indeterminate cleavage?

    <p>Deuterostomes</p> Signup and view all the answers

    In bilaterians, which tissue layer covers the embryo's surface?

    <p>Ectoderm</p> Signup and view all the answers

    During cleavage, what is the result of each cell division?

    <p>Smaller cells</p> Signup and view all the answers

    What is the characteristic of protostome gastrulation?

    <p>Gastrulation becomes the mouth</p> Signup and view all the answers

    What is the consequence of removing a cell in a protostome embryo?

    <p>The cell removed dies</p> Signup and view all the answers

    What is a characteristic of deuterostome cleavage?

    <p>Indeterminate cleavage</p> Signup and view all the answers

    What is the name of the space between the ectoderm and endoderm in cnidarians?

    <p>Mesoglea</p> Signup and view all the answers

    What is the significance of the coelom in constructing evolutionary trees?

    <p>It is often lost in some groups</p> Signup and view all the answers

    What is a characteristic of platyhelminthes?

    <p>They are acolomate</p> Signup and view all the answers

    What is the general term for the three layers present in bilaterian embryos?

    <p>Germ layers</p> Signup and view all the answers

    What is the term for the study of the development of the fertilized ovum?

    <p>Embryology</p> Signup and view all the answers

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