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Equilibrium frequencies, qa, of a gametophytic lethal allele in the absence of selfing. The range of double reduction values, α, shown is only from 0 to 0.01, at which point most of the reduction in frequency has already taken place. The equilibrium frequencies for α = 0.17 are 5 × 10−5 and 5 × 10−6 when the mutation rates, μ, are 10−5 and 10−6, respectively.
