Embryonic Development
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Questions and Answers

During early avian development, which structure marks the future site of the primitive streak?

  • Primitive shield
  • Endoderm
  • Epiblast (correct)
  • Hypoblast
  • Which factor is responsible for regulating the left-right axis in avian development?

  • Gravitational forces
  • Tf Pitx2
  • Rotational forces
  • Activin (correct)
  • In the context of avian development, what is the function of the avian organizer?

  • Induces primitive streak formation (correct)
  • Controls early cleavage divisions
  • Determines extraembryonic membrane formation
  • Regulates anterior-posterior polarity
  • What is the major body axis defined by the dorsal lip/shield in avian embryonic development?

    <p>Anterior-posterior axis</p> Signup and view all the answers

    In early avian development, which structure gives rise to the future ectoderm?

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

    What is the main process involved in epiboly?

    <p>Progression of the blastoderm and EVL</p> Signup and view all the answers

    Which structure is responsible for establishing the dorsal-ventral axis in avian development?

    <p>Body Plan Organizer</p> Signup and view all the answers

    What is the main morphogen responsible for ventral-dorsal axis formation in avian embryos?

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

    Which process brings the hypoblast and epiblast cells to the dorsal side during avian gastrulation?

    <p>Convergence and extension</p> Signup and view all the answers

    What small transiently present organ helps establish visceral laterality in avian development?

    <p>Kupffer’s vesicle</p> Signup and view all the answers

    Which signaling pathway plays a key role in establishing the dorsal-ventral axis in avian embryos?

    <p>Wnt/PCP signaling</p> Signup and view all the answers

    What is formed when cells move inward through the primitive streak during late gastrulation?

    <p>Mesoderm and endoderm</p> Signup and view all the answers

    Which cells form the yolk sac in mammals?

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

    What is the role of the visceral endoderm in mammalian gastrulation?

    <p>Regulate cell movement of epiblast</p> Signup and view all the answers

    Which cells are in contact with trophoblast in the yolk sac?

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

    What is critical for positioning the primitive streak in mammals?

    <p>Anterior visceral endoderm (AVE)</p> Signup and view all the answers

    What governs the ciliary cells of the Node in mammalian left-right axis formation?

    <p>PCP (planar cell polarity)</p> Signup and view all the answers

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