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6. The interaction between which two signalling pathways contributes to the maintenance of segment boundaries in Drosophila?

  • Wingless (Wnt) and Runt
  • Hedgehog and Wingless (Wnt)
  • Hedgehog and Engrailed
  • Sonic hedgehog and wingless

7. The response of the neural tube to sonic hedgehog protein depends on the concentration of the protein

  • True
  • False

8. Which of these is not a model organism?

  • Rattus rattus
  • Arabidopsis thaliana
  • C. elegans
  • Xenopus laevis

9. What is the function of the engrailed gene in arthropods

  • To produce bands of denticles over the larvae
  • To define the positional identity (front and back) of segments
  • To code for a transcription factor which activates other genes relating to the development of camera eyes
  • To control cell differentiation in embryos

10. What is the name of cell adhesion molecules?

  • Lopsins
  • Cadherins
  • Integrins
  • Hesins

11. What is the name for programmed cell death?

  • Apoptosis
  • Gastrulation
  • Proliferation
  • Differentiation

12. Which genes are only found in particular cells to help characterise it?

  • Characterising genes
  • Terminal target genes
  • Regulatory genes
  • Housekeeping genes

13. Which gene does the Wnt signalling pathway activate in Drosophila?

  • Wingless
  • Engrailed
  • Int
  • Hedgehog