The objective of this study was to study the heritability, correlations and the genetic gains for grain yield and protein content in the populations of Ege 88 and Kunduru cultivars irradiated with different doses of gamma rays. The experiment was conducted over three years (from 1997 to 2000) in Bornova-Izrnir, Turkey. The seeds of the two cultivars were irradiated by 0 (control), 5, 10, 15, 20 and 25 krad doses of gamma rays just before sowing in 1997. In the 1997-98 and 1998-99 growing seasons, the irradiated seeds were grown in a randomized complete block design (RCBD) with two replications. In 1998-99, 150 spikes of wheat were taken from each plot, bulked and grown in RCBD with two reps in 1999-2000. In each generation, plant height (cm), heading date (days), thousand kernel weight (g) and grain yield/plot (g) were measured and protein content (%) was determined. Using the data, the analysis of variance, phentoypic and genotypic variances, heritabilities and genetic gains and correlation analysis were performed.