Corn (Zea Mays L.) is annual, cultivated plant. Due to separation of generative organs, and the different time of maturing of male and female flowers on the same plant, corn is very open pollinated plant. Inbred lines are homozygous breeding lines that are used as parents of hybrid cultivars in open fertilized species. Such lines are formed by self-fertilization, inbreeding, backcrossing or by dihaploid method. Since homozygosity is best achieved by self-fertilization, this procedure is most often used in the development of an inbred line. Varieties of open fertilized plant species must undergo self-fertilization to reduce heterozygosity in the progeny and to create a certain number of different homozygous lines. The crossing of inbred lines, depending on the number of parents, can be single cross, triple cross, double cross or backcross. The most common method of developing new lines of self-fertilizing plants is the pedigree method, and the same is used in the open fertilized plants. The lines developed by the pedigree method are homozygous and homogeneous, but with new gene combinations. The procedure begins after the selection of individual plants for crossing to obtain F1 generation, which is genotypically and phenotypically uniform and there is no choice in it. After self-fertilization of the F1 generation plants, the skimmed seed is sown and grown in the F2 generation, and the procedure is repeated until in one line is achieved plant uniformity; this is usually in the F5 - F7 generation. In a study conducted during 2008, the data of the F3 progeny properties were collected. Descriptive statistical methods were used to estimate the variability of the analyzed properties (piston length, piston diameter, piston mass, number of piston rows) for the progeny of certain hybridization combinations. By analysis of variability and correlation, significant differences were found in the deviations and correlations of certain properties, both within and between the crossing combinations. The differences between the progeny, which proved to be significantly significant, of different combinations of crossings for all analyzed properties were examined with the help of analysis of variance.