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4.5 Chick Development — Test 1
Q1. In the chick embryo, the structure equivalent to the amphibian dorsal blastopore lip is:✓ Hensen's node
Q2. The primitive streak in the chick embryo is the equivalent of the amphibian:✓ Blastopore
Q3. In the chick, ectoderm, mesoderm and endoderm all arise from the:✓ Epiblast
Q4. The fertilized chick egg undergoes which type of cleavage?✓ Discoidal meroblastic (not extending into the yolk)
Q5. Hensen's node in the chick is located at the:✓ Anterior end of the primitive streak
Q6. Evidence that Hensen's node is the avian organizer includes that, when transplanted, it:✓ Induces and patterns a second embryonic axis
Q7. Hensen's node and the Spemann organizer support their equivalence by:✓ Expressing the same organizer marker genes
Q8. In the avian embryo, the fluid-filled blastocoel-like cavity forms between the:✓ Epiblast and hypoblast
Q9. Migration of cells through the chick primitive streak is controlled by Fgf8, which:✓ Repels migrating cells away from the streak
Q10. If Fgf8 is over-expressed in the chick primitive streak, the likely result is that:✓ Cells of the streak fail to form the paraxial mesoderm
Q11. The dorsal lip of the amphibian blastopore corresponds in the chick to:✓ Hensen's node
Q12. Koller's sickle in the chick embryo is:✓ A thickening of the epiblast at the posterior edge of the area pellucida
Q13. The hypoblast in the chick embryo is largely:✓ Extra-embryonic, but helps position the primitive streak