Table 3.

Three questions about selectively neutral, polygenic phenotypes and their answers under the extended Edwards model.

Question	Answer	References
1: How does the standardized difference in population means for the trait (DT) change as k, the number of loci influencing the trait, increases?	As k grows, the typical absolute size of DT does not change, but the distribution of DT approaches normality.	Eq. 38, Figure 3.
2: What is the expected proportion of variance in the trait that is accounted for by genetic differences between the populations, E(QST)?	It is approximately equal to, and no larger than, the proportion of allelic variance at a single locus attributable to genetic differences, FST.	Eqs. 42, 43, Figure 4.
3: Does the trait become increasingly useful for classification as the number of loci grows?	No.	Eq. 46, Figure 5.