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Table 1 MK table for the Adh gene [3] showing numbers of fixed differences and polymorphic sites between and within D. melanogaster, D. simulans and D. yakuba

From: Detecting positive selection in the genome

  Differences (D) Polymorphism (P)
Nonsynonymous 7 2
Synonymous 17 42
  1. Note that the ratio of fixed nonsynonymous to synonymous differences (7/17) is substantially higher than the ratio of nonsynonymous to synonymous polymorphisms (2/42), indicating that some amino acid differences are adaptive
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