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 (B)</p> Signup and view all the answers

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

<p>Sperm entry (C)</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 (A)</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 (C)</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 (C)</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 (D)</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 (B)</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 (B)</p> Signup and view all the answers

What process generates the hypoblast during early gastrulation stage?

<p>Involution (C)</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 (D)</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 (B)</p> Signup and view all the answers

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

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

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

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

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