Histograms summarizing the frequency of seed classes in RIL × A. arenosa progeny. The means for the %N, %G, %V, %NGV, and %N/NV (x axes) were calculated from six replicates of each RIL × A. arenosa, and the number of RILs with a given mean value are tallied on the y axis. The means of the entire RIL population, the Col-0 parent, and the C24 parent are indicated by labeled arrows. The distribution of phenotypic performance depends on the trait. For %NGV, and somewhat less for %N, %G, and %V, most RILs fall close to the lower value Col-0 parent. For %N/NV, most lines perform close to the parental midpoint. For all traits, a few lines equal or surpass the mean values of C24.