problemset4

problemset4 - MCDB 4650 Problem Set 4 Due by 2/13/10 1 AM...

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MCDB 4650 Problem Set 4 Due by 2/13/10 1 AM 1. (2) Assume that you can ectopically express chordin on the ventral side of a Xenopus gastrula stage embryo. Describe two effects you would predict to result from the ectopic chordin expression and explain why. 2. (2) When cells of the archenteron roof in a late stage gastrula are transplanted into an early gastrula, different results are seen depending on where in the late stage embryo these cells are taken from. (note: the archenteron roof cells are just the mesoderm that has moved in via gastrulation). Explain why this result is seen, including the molecules likely being secreted by these cells. (figure is 10.34 in your book). 3. (1) Using the information in the figure, and what you learned in class, pick the best reason why early isolated animal caps do not make neural cells. a. BMPs are not present to block neural fate in the early stage animal cap b. The early animal cap cells are committed to becoming epidermis c. Chordin and noggin are not present to block
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This note was uploaded on 02/25/2010 for the course MCDB 4650 taught by Professor Staff during the Spring '08 term at Colorado.

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problemset4 - MCDB 4650 Problem Set 4 Due by 2/13/10 1 AM...

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