Expected variance contributed by mutant genes before fixation for population size 100, specified dominance on the quantitative trait (a vs d) and selective (dis)advantage (s in heterozygote and homozygote)a.

ae.g., if the mutant gene is completely recessive for the trait and for fitness, d = −a and s(hom) = 0.bEqually likely to be completely dominant or recessive mutants, hence values as in Table 2.