3.3 Two inbred cultivars of wheat were hybridized, and the seed of 48 F2-derived F3 families

(that is, families in the third progeny generation, each derived by inbreeding from a single plant in the second progeny generation) was obtained. The seed was sown in field plots in competition with ryegrass, in two replications in a randomized block design, with ‘family’

as the treatment factor. The mean grain yield per plant was determined in each plot.

The results obtained are presented in Table 3.13. (Data reproduced by kind permission of S. Mokhtari.)