Fig. 6. A model explaining generation of ‘gynoecious loss’ monecious mutants from F gene-based gynoecious cucumber plants through unequal crossing over (UCO).

a At meiosis, UCO between the two copies results in two types of gametes with single or triple copies of the 30-kb region. b Self-pollination among gynoecious plants carrying the two types of gametes produces gynoecious (G, three F genes) and subgynoecious (SubG, equivalent of Ff heterozygotes) plants. c Self-pollinated progeny of SubG plants will segregate for G, SubG, and monecious (M) plants. d The illustrated genomic structure is same as in Fig. 3a. Red triangles show the F gene