Embryonic Development: Epiboly, Involution, and Gastrulation

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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?

Descent of the egg in the uterus Signup and view all the answers

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

Sperm entry Signup and view all the answers

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

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

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

The deep cells move outward to intercalate with surface cells Signup and view all the answers

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

Marks the beginning of gastrulation Signup and view all the answers

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

Migration of deep cells to intercalate with surface cells Signup and view all the answers

How do cells behave in specific regions during early gastrulation?

Cells show plasticity and can change their fate Signup and view all the answers

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

Blastoderm, EVL, and YSL Signup and view all the answers

What process generates the hypoblast during early gastrulation stage?

Involution Signup and view all the answers

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

Wnt/PCP signaling Signup and view all the answers

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

Establishing the dorsal-ventral axis Signup and view all the answers

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

Retinoic acid Signup and view all the answers

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

Kupffer's vesicle Signup and view all the answers

Embryonic Development: Epiboly, Involution, and Gastrulation

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