When does the human embryo undergo gastrulation?

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Which of the following aspects of human development could be researched using C. elegans (worm) as a model?

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There are three major components of the cytoskeleton. Put them into order from largest to smallest fibres:

If a cell changes from a mesenchymal state to an epithelial state, what kind of change is most likely to have occurred in the cell?

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1) You have a series of fixed embryonic sections to stain and image for your study - what stain and imaging technique (eg haematoxylin, eosin, immunofluorescence, light, fluorescence microscopy) would be the best to use, and why?  (3 marks)  

2. You are designing a study to model the human development of your DEV2011 cell type in a model organism. In which of the following organisms would you choose to undertake this study, and why? Choose from C. cerevisiae (yeast), C. elegans (worm), D. melanogaster (fruitfly), or G. gallus (chicken). (3 marks)

Signalling between cells is essential for patterning of the embryo and differentiation into different cell types.  

Which of the features below is characteristic of signalling by a paracrine ligand?  Select all options that apply.  

Paracrine ligands: 

Which of the following tissues undergoes gastrulation?

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From which germ layer does the notochord develop?

Adhesion of neural tube epithelial cells requires transmembrane ______________ connected intracellularly to ___________________. 

At what stage of development does the human embryonic genome switch on?

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