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- The authors found several large chromosomal inversions. They state that “theory predicts that selection can favour molecular mechanisms that suppress recombination between independent adaptive loci”. Inversions is a mechanism that suppresses recombination. Describe in your own words what you think they mean (hint: it is similar to the theory of how differentiated sex chromosomes, like human X and Y chromosomes, evolve).
- What percent of the highly divergent genomic regions contain non-synonymous protein-coding mutations (figure 6)? What is your null hypothesis for the expected percent of highly divergent genomic regions that contain non-synonymous mutations (not a percentage, but rather how would you calculate your expectation)?
- The authors state that their results “add to growing evidence that chromosome inversions are a common genomic mechanism that maintains contrasting ecotypes in hybridizing natural populations.” How many inversions did they find out of how many highly divergent genomic regions? Do you think this conclusion is justified? Why or why not?
- The title of the paper is “The genomic basis of adaptive evolution in threespine stickleback”. Do you think this “conclusion” is justified? Why or why not? If not, propose a different title. It can be as long as you’d like.
- 5. What would be exciting next steps/future directions? Why?