CHAPTER SUMMARY

VOCABULARY FLASH CARDS

STUDY QUESTIONS

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Study Questions

1. Suppose we could produce an embryo of C. elegans that had no maternal or zygotic source of Mom5 protein. What would be the consequence of the absence of this protein?

ANSWER

2. The receptor Notch is involved in lateral inhibition. The cell with Notch receives signals telling it not to adopt the same fate as the cell sending the signal. How far do you think this lateral inhibition could spread? Can you devise experiments to test your proposal?

ANSWER

3. In a Drosophila embryo bearing a null mutation of the gene i, the embryo forms seven normal odd-numbered segments, but the seven even-numbered segments are all very defective. Why is this so?

ANSWER

4. Below is the spatial order of expression of the genes otd and ems in the three anterior (ant) head segments; also shown are the principal sites of expression of the eight homeotic genes of the HOM complex expressed in the 14 segments of the posterior part of the head (H1 through H3), the thorax (T1 throughT3), and the abdomen (A1 through A8): Suppose the entire bithorax complex of genes has been rendered null by a deletion; in other words, there is no Ubx, AbdA, or AbdB function. What would be the identity of the different segments? Explain your answers.

ANSWER

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