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Questions and Answers
During early avian development, which structure marks the future site of the primitive streak?
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?
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?
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?
What is the major body axis defined by the dorsal lip/shield in avian embryonic development?
In early avian development, which structure gives rise to the future ectoderm?
In early avian development, which structure gives rise to the future ectoderm?
What is the main process involved in epiboly?
What is the main process involved in epiboly?
Which structure is responsible for establishing the dorsal-ventral axis in avian development?
Which structure is responsible for establishing the dorsal-ventral axis in avian development?
What is the main morphogen responsible for ventral-dorsal axis formation in avian embryos?
What is the main morphogen responsible for ventral-dorsal axis formation in avian embryos?
Which process brings the hypoblast and epiblast cells to the dorsal side during avian gastrulation?
Which process brings the hypoblast and epiblast cells to the dorsal side during avian gastrulation?
What small transiently present organ helps establish visceral laterality in avian development?
What small transiently present organ helps establish visceral laterality in avian development?
Which signaling pathway plays a key role in establishing the dorsal-ventral axis in avian embryos?
Which signaling pathway plays a key role in establishing the dorsal-ventral axis in avian embryos?
What is formed when cells move inward through the primitive streak during late gastrulation?
What is formed when cells move inward through the primitive streak during late gastrulation?
Which cells form the yolk sac in mammals?
Which cells form the yolk sac in mammals?
What is the role of the visceral endoderm in mammalian gastrulation?
What is the role of the visceral endoderm in mammalian gastrulation?
Which cells are in contact with trophoblast in the yolk sac?
Which cells are in contact with trophoblast in the yolk sac?
What is critical for positioning the primitive streak in mammals?
What is critical for positioning the primitive streak in mammals?
What governs the ciliary cells of the Node in mammalian left-right axis formation?
What governs the ciliary cells of the Node in mammalian left-right axis formation?
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