Population genomics of the wild yeast Saccharomyces paradoxus: Quantifying the life cycle

1. 

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   Fig. 1.

   Lack of correlation between genetic differentiation θ_π and geographic distance in the U.K. population. Each point represents a different pair of strains.

   
   
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   Fig. 2.

   Lack of correlation of θ_S from LTR fragments in the European and Far East populations, for regions that were present in both populations. Each point represents fixed LTRs from a different intergenic region (Pearson r = 0.24, P = 0.48).

   
   
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   Fig. 3.

   Linkage disequilibrium (i.e., correlation of alleles) between pairs of polymorphic sites as a function of physical distance between the two sites. Points are average r ² for all pairs within a particular distance, with 1-kb increments. The lines show the two 97.5% upper and 2.5% lower bounds calculated from 1,000 datasets generated under a neutral coalescent model, given the length of sequences, number of polymorphic sites, and the rholike estimate of ρ (from Table 2; using the ms program in ref. 49). The asymptote (i.e., the expected r ² when there is no association between alleles) is 1/n, where n is the number of sequences (1/12 = 0.083 for Europe and 1/8 = 0.125 for the Far East).

   
   
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   Fig. 4.

   A quantitative life cycle for the European population of S. paradoxus is shown.