Figure 2

Sample size as a function of allele frequency and fitness dominance. Sample sizes (n) required to detect selection at a significance level of 0.05 and a power of 0.5 are plotted as a function of allele frequency and fitness dominance; scale on the y-axis is logarithmic; A) Weak selection (k = 0.99); B) Strong selection (k = 0.9); C) Unequal allele frequencies (p = 0.1 and q = 0.9); D) Equal allele frequencies (p = 0.5 and q = 0.5).