Abstract
The number of segregating genes affecting a quantitative character in a single cross can be estimated by dividing the square of the deviation of the most extreme doubled haploid from the sample mean by the genotypic variance of doubled haploids. The number of segregating genes was estimated for 3 characters in 4 crosses of barley (H. vulgare L.). The number of segregating genes for grain yield, heading date and plant height ranged 5-11, 6-9, and 4-13, respectively.