Sоx prоteins аre trаnscriptiоn fаctors, so one hypothesis to explain the different morphologies of mouse and chick lung would be that Sox9 is activating expression of a gene in chick lung that results in fusion of the bronchial tips. Imagine you have identified a gene - let's call it Fuse1 - that you think is the molecule responsible for tip fusion in chick. Design a move it experiment to test your hypothesis that Fuse1 is the molecule responsible for bronchial tip fusion in developing chick lungs. Describe a result that is consistent with your hypothesis, and one that is inconsistent with your hypothesis.
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