Embryonic Development: Epiboly, Involution, and Gastrulation
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Embryonic Development: Epiboly, Involution, and Gastrulation

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Questions and Answers

What is the main process that occurs during gastrulation?

  • Formation of the primitive streak (correct)
  • Symmetric cell divisions
  • Epiblast migration
  • Yolk axis specification

    • Which axis is regulated by Nodal and tf Pitx2 during development?

  • Anterior-posterior axis
  • Medio-lateral axis
  • Dorsal-ventral axis
  • Left-right axis (correct)

    • What is the significance of the dorsal lip during early development?

  • Endoderm formation
  • Formation of the primitive streak (correct)
  • Cell migration into the blastocoel
  • Epiblast migration

    • Which event establishes the anterior-posterior polarity in avian development?

    <p>Descent of the egg in the uterus</p> Signup and view all the answers

    During early development of mammals, what factor determines the position of the 1st cleavage?

    <p>Sperm entry</p> Signup and view all the answers

    What is the main purpose of a fate map in zebrafish development?

    <p>To identify specific regions that give rise to certain tissues</p> Signup and view all the answers

    What is a key characteristic of the early gastrulation stage in zebrafish?

    <p>The deep cells move outward to intercalate with surface cells</p> Signup and view all the answers

    What is the significance of germ ring and embryonic shield formation in the late-blastula stage of loach?

    <p>Marks the beginning of gastrulation</p> Signup and view all the answers

    What happens during 50% epiboly at 9 hpf in loach development?

    <p>Migration of deep cells to intercalate with surface cells</p> Signup and view all the answers

    How do cells behave in specific regions during early gastrulation?

    <p>Cells show plasticity and can change their fate</p> Signup and view all the answers

    During the progression of epiboly in zebrafish, which cellular components are involved in vegetal spreading?

    <p>Blastoderm, EVL, and YSL</p> Signup and view all the answers

    What process generates the hypoblast during early gastrulation stage?

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

    Which signaling pathway is responsible for establishing the dorsal-ventral axis in zebrafish during gastrulation?

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

    What is the role of the embryonic shield (dorsal lip) in zebrafish embryonic development?

    <p>Establishing the dorsal-ventral axis</p> Signup and view all the answers

    Which morphogen is responsible for patterning the neural ectoderm in zebrafish?

    <p>Retinoic acid</p> Signup and view all the answers

    What transient ciliated organ helps establish visceral laterality in zebrafish during early development?

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

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