17 Questions
During early avian development, which structure marks the future site of the primitive streak?
Epiblast
Which factor is responsible for regulating the left-right axis in avian development?
Activin
In the context of avian development, what is the function of the avian organizer?
Induces primitive streak formation
What is the major body axis defined by the dorsal lip/shield in avian embryonic development?
Anterior-posterior axis
In early avian development, which structure gives rise to the future ectoderm?
Epiblast
What is the main process involved in epiboly?
Progression of the blastoderm and EVL
Which structure is responsible for establishing the dorsal-ventral axis in avian development?
Body Plan Organizer
What is the main morphogen responsible for ventral-dorsal axis formation in avian embryos?
Nodal
Which process brings the hypoblast and epiblast cells to the dorsal side during avian gastrulation?
Convergence and extension
What small transiently present organ helps establish visceral laterality in avian development?
Kupffer’s vesicle
Which signaling pathway plays a key role in establishing the dorsal-ventral axis in avian embryos?
Wnt/PCP signaling
What is formed when cells move inward through the primitive streak during late gastrulation?
Mesoderm and endoderm
Which cells form the yolk sac in mammals?
Hypoblast cells
What is the role of the visceral endoderm in mammalian gastrulation?
Regulate cell movement of epiblast
Which cells are in contact with trophoblast in the yolk sac?
Hypoblast cells
What is critical for positioning the primitive streak in mammals?
Anterior visceral endoderm (AVE)
What governs the ciliary cells of the Node in mammalian left-right axis formation?
PCP (planar cell polarity)
Learn about the major body axes formation, cell migration in the primitive streak, and the specification of different germ layers during early embryonic development in organisms. Explore how gravitational and rotational forces can alter the anterior-posterior polarity and the regulation of the left-right axis.
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