Models of quantitative genetic variation that depend on overdominance in fitness of the loci involved thus predict that this variation will be greatly reduced in populations with very high rates of selfing, although there may be little effect below some selfing rate that depends on the
selection coefficients at the loci involved.
The effective
selection coefficient [s.sub.m] acting on m at the quasi-equilibrium is
In the linear additive model, therefore, we can easily calculate the additive genetic variance and
selection coefficient based on this theorem (Price, 1972; Hartl, 1988; Ewens, 1989).
The change of recessive allele frequency as the function of this frequency in the previous generation q and the
selection coefficient s is calculated as (Crow & Kimura, 1970: eq.
This position is supported by the fact that estimates of the degree of inbreeding depression for fitness in Drosophila are in very good agreement with expectations based on the estimates of mutation rates,
selection coefficients, and coefficients of dominance obtained from mutation-accumulation experiments (Simmons and Crow 1977; D.
Selection coefficients and differentials were considered to be significantly different from zero only if the 95% confidence interval did not include zero.
The resulting
selection coefficients (s = 1 - [omega]) indicate that immigrants invading mature demes face much stronger selection gradients than invaders of young deme s (Table 4).
The [[Tau].sub.j] are a common type of kin
selection coefficient, the slope of recipient genotype on actor genotype.
With synergistic epistasis, the
selection coefficients of individual mutations are effectively magnified as deleterious mutations accumulate in a genome, and for mutations with equivalent effects, this has the effect of progressively reducing the probability of fixation, eventually to zero.
The
selection coefficient of the advantageous allele was generally small, ranging from 0.002 to 0.02.
The
selection coefficient estimates do not rely upon distributional assumptions (Lande and Arnold 1983), but the standard parametric significance tests assume normality of residuals (Neter et al.
The magnitude of the
selection coefficient, S, for selection exerted on corolla flare by bumblebees at seed set was calculated from the slope of the regression line (Lande and Arnold 1983).
