By R. W. Allard, A. L. Kahler, M. T. Clegg (auth.), Freddy B. Christiansen, Tom M. Fenchel (eds.)
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Extra resources for Measuring Selection in Natural Populations
This result supports the results shown in Table 6 in indicating that the mating system is itself under selection and that the mating system is adjusted by selection to be in proper balance with the total recombinational system. The adjustment can be over very wide ranges, even within a single species, as illustrated by CoZZinsia in which different populations vary from heavily inbred to very nearly random mating. Selection in plants 12 TabZe 7. 10 a: From Kahler, Clegg and Allard (1975). Additional data provide these revised outcrossing estimates.
This leakage in the self-incompatibility system is probably responsible for most of the breeding observed. ) However, there is still a signifi- TabZe 4. "Goodness of Fit" of LoZium muZtifZorum seedlings to Wright's Equilibrium Law (peroxidase). 093 Genotype 11 12 22 Observed 675 240 57 Expected p 2 2pq(1-F) q Expected No. 7189. 05 2 + pqF Selection in plants 8 cant departure from expectations according to Wright's equilibrium law, which indicates that some factor or factors in addition to the inbreeding measured at the peroxidase locus operate during the reproductive cycle.
Neither of these tests are significant. Figure 7 shows the variation of the male gamete frequency through time, and it is seen that the high test value is due to an extremely low frequency of the allele EstIll in the sample of 1973. For the adults, some temporal heterogeneity is indicated in the gene frequency as both the oldest and the youngest cohort show extreme values (Fig. ). 5 22 11 • • • • • I·· .. ... -,. • -- ------•- - ---- - • • I l. , n- 73- 73 74 year Figure 6. Year to year adult viability of the EstIII genotypes among male homozygotes relative to that of the heterozygote (From Christiansen, Frydenberg & Simonsen 1977) 6) Male reproductive selection.