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Berry, A.J. (Princeton University, Princeton, NJ); Ajioka, J.W; Kreitman, M
Genetics, 12/1991, Letnik: 129, Številka: 4Journal Article
Evolutionary processes can be inferred from comparisons of intraspecific polymorphism and interspecific divergence. We sequenced a 1.1-kb fragment of the cubitus interruptus Dominant (ciD) locus located on the nonrecombining fourth chromosome for ten natural lines of Drosophila melanogaster and nine of Drosophila simulans. We found no polymorphism within D. melanogaster and a single polymorphism within D. simulans; divergence between the species was about 5%. Comparison with the alcohol dehydrogenase gene and its two flanking regions in D. melanogaster, for which comparable data are available, revealed a statistically significant departure from neutrality in all three tests. This lack of polymorphism in the ciD locus may reflect recent positive selective sweeps on the fourth chromosome with extreme hitchhiking generated by the lack of recombination. By simulation, we estimate there to be a 50% chance that the selective sweeps occurred within the past 30,000 years in D. melanogaster and 75,000 in D. simulans
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