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In Both Insects and Mammals, Most ORNs Express Only One

Question 13

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In both insects and mammals, most ORNs express only one specific odorant receptor, and the axons of ORNs that express the same odorant receptor project to the same glomerulus. Is this similarity in organization likely to be due to shared ancestry or to convergent evolution? Briefly explain your reasoning.

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A couple of lines of evidence suggest th...

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