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Questions and Answers
During gastulation in Xenopus and zebrafish, which process causes the endoderm to move inwards and sandwich the mesoderm between endoderm and ectoderm?
In which organism does the primitive streak form, through which cells pass to receive signals on which germ layer to become?
Which organism exhibits convergent extension to allow the embryo to get longer by cells becoming narrower and longer as they converge and extend towards the anterior pole of the embryo?
Which process involves individual cells leaving a sheet and moving inwards to become mesenchyme (embryonic connective tissue)?
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What is the process in which sheets of cells roll inwards into the embryo to form an underlying layer?
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In which organism does the primitive streak form, through which cells pass to receive signals on which germ layer to become?
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What is the name of the process where individual cells leave a sheet and move inwards to become mesenchyme (embryonic connective tissue)?
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What is the process in which sheets of cells bend inwards?
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In which organism does the mesoderm move into the embryo first by invagination followed by the endoderm?
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Which process involves individual cells leaving the sheet and moving inwards to become mesenchyme (embryonic connective tissue)?
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What is the name of the furrow through which cells pass to receive signals on which germ layer to become?
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Study Notes
Gastrulation
- During gastrulation in Xenopus and zebrafish, invagination causes the endoderm to move inwards and sandwich the mesoderm between endoderm and ectoderm.
Formation of Primitive Streak
- The primitive streak forms in amniotes (such as chickens and mammals), through which cells pass to receive signals on which germ layer to become.
Convergent Extension
- Convergent extension occurs in Xenopus, allowing the embryo to get longer by cells becoming narrower and longer as they converge and extend towards the anterior pole of the embryo.
Epithelial-Mesenchymal Transition (EMT)
- EMT involves individual cells leaving a sheet and moving inwards to become mesenchyme (embryonic connective tissue).
Invagination
- Invagination is the process in which sheets of cells bend inwards into the embryo to form an underlying layer.
Mesoderm Migration
- In amniotes (such as chickens and mammals), the mesoderm moves into the embryo first by invagination, followed by the endoderm.
Germ Layer Formation
- The primitive streak is the furrow through which cells pass to receive signals on which germ layer to become.
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Description
Test your knowledge of internalisation mechanisms in embryonic development and examples of gastrulation in Xenopus and zebrafish. Learn about invagination, involution, and ingression processes during early embryo formation.
