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The introduction of gibberellin-responsive reduced height (GAR <i>Rht</i>) alleles is a promising tool for breeding semi-dwarf, high-input varieties of wheat. We have compared recombinant isogenic lines F_2:3 carrying dwarfing allele <i>Rht13</i> and without dwarfing alleles, obtained from the cross of isogenic lines and selected from F₂ using molecular markers. After phenotyping and statistical analysis, we found that the <i>Rht13</i> allele reduces total plant height by 13.0 cm (17.4%), while the proportions between the internodes in tall and short plants remain similar. The greatest decrease in length in plants with <i>Rht13</i> in comparison to wild-type plants is observed for the second internode (5.3 cm, or 31.9%). Due to the presence of <i>Rht13</i>, semi-dwarf plants, compared to the wild type, had a higher grain number per main spike, grain number per spikelet and higher number of productive tillers, and a slightly higher harvest index, although thousand grain weight and grain weight in the main spike were lower. Our results indicate the possibility of using <i>Rht13</i> in the breeding of wheat varieties without dramatic negative effects on yield and plant development.