“…The median heritability was .41 with an interquartile range of .29 to .54. Martin et al (1953), Brunson et al (1956), Goodman et al (1957Goodman et al ( , 1960 and Kan et al (1959) found that nonadditive effects were small while Yao (1959Yao ( , 1961 reported significant dominance effects in certain incrosses and incrossbreds. Although the overall range of the estimates given in Figure 1 may appear wide it should be remembered that several methods of estimations were employed and that the parameters were obtained for many different populations.…”