ICQs15,16

ICQs Class 16 P Click to edit Master title style Click to edit Master text styles Second level Third level Fourth level Fifth level Click to edit Master text styles Second level Third level Fourth level Fifth level i and ii are epithelial, iii and iv are mesenchymal ii, ii, iv are epithelial, iii is mesenchymal i, ii, iii are epithelial, iv is mesenchymal i and iii are epithelial, ii and iv are mesenchymal ii and iii are epithelial, i and iv are mesenchymal ICQs class 15 G 10.5 Xenopus fate map 2. By what embryonic stage are all these fates determined a. Before fertilization b. At fertilization c. Before gastrulation begins d. By the middle-end of gastrulation e. After gastrulation is complete 3. Which mesodermal precursor cells enter the blastopore first in Xenopus gastrulation a. presumptive head (anterior) mesoderm b. presumptive tail (posterior) mesoderm. 4. The bottle cells that initiate involution at the blastopore are (.5 pts) a. presumptive ectodermal cells. b. presumptive mesodermal cells. c. presumptive endodermal cells. 4. The notochord (chord of cells underlying the neural tube) is composed of Cells from the organizer Cells from the Niewkoop center Ectodermal cells from the animal cap Endodermal cells derived from the bottle cells What would happen if you were to inject N-cadherin into the cells that normally make the surface ectoderm before neurulation neurulation begins but cannot complete Adhesion molecules play a role in separation of neural tube from overlying epidermis Work with your group to propose a role for how pax-3 and p53 might be involved in neural tube defects Can you draw a pathway Pax-3 and p53 double mutants did not have neural tube defects