| Summary: | Purpose and Objectives. Our purpose was to study the inheritance of the spike productivity elements by F1 hybrids from tester crosses of winter bread wheat varieties of different geographical origins. Materials and Methods. Twenty hybrid combinations from tester crosses were studied. Field studies were conducted in 2017–2019. The experiments were laid out in accordance with the requirements of breeding field experiments. F1 hybrids and their parents were sown with a hand planter within the optimal timeframe. The row length was 1 meter; the distance between the rows was 20 cm; the depth was 4–6 cm; the predecessor was black fallow. 20 kernels per row were sown. Data were statistically processed, as B.A. Dospekhov recommended. The phenotypic dominance degree for breeding traits in the hybrid combinations was calculated by B. Griffing’s formula. The obtained data were grouped in accordance with G.M. Beil. and R.E. Atkins’s classification. Results and Discussion. In 2018, in 50% of the hybrids, the ‘spike length’ trait was inherited by overdominance; in 2019 and 2020, this type of inheritance prevailed, accounting for 95% and 70%, respectively. Positive dominance of this train in 2018 was observed in five combinations (25%). In 2019 and 2020, this type of inheritance was observed in one combination (5%) and in two combinations (10%), respectively. Intermediate inheritance was observed in four combinations (20%) in 2018 and in three combinations (15%) in 2020. Negative dominance was recorded in the of Vodohrai Bilotserkivskyi / Arktis combination (hct = -0.9) in 2018 and in the Korovaina / Kanada combination (hct = -0.8) in 2020. In 2018 and 2020, the ‘spikelet number per spike’ trait was inherited by overdominance in 85% of the combinations; in 2019, this type of inheritance was observed in 100% of the combinations. In 2018, two combinations, namely Korovaina / Kanada (hct = 1.0) and Vodohrai Bilotserkivskyi / Kanada (hct = 0.7), inherited this trait by positive dominance, and the Ladyzhynka / Kanada combination ...
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