Cotyledon tops bifurcation Avdeyev, Y . I . Russian Scientific Research institute of Irrigative Vegetable and Melon Growing In one tomato line of the variety Bachtemir we found a mutation expressed as a bifurcation of the cotyledon tops by a central vein . The degree of cut in the bifurcation varied from faint to 0 . 3 - 0 . 5 cm in length . The property is recessive . The ratio of normal plants to mutants in the F2 was 19:6 and 47:14, showing a monohybrid inheritance (X 2 = 0 . 013, X 2 = 0 . 136) . The described gene is best identified after the appearance of cotyledons . It has no negative influence on other production - related traits . For this discovered gene determining cotyledon tops bifurcation, the symbol ctb is proposed .