Introgressive Hybridization between the Synthetic Allotetraploid in Cucumis and Cultivated Cucumber and Assessment of the Genetic Variation in theProgenies Comparison of gene flow among species that occur within the same geographic locations versus gene flow among populations within species reveals introgression among several Elymus species Genomic Rearrangement in Endogenous Long Terminal Repeat Retrotransposons of Rice Lines Introgressed by Wild Rice (Zizania latifolia Griseb.) Population genetic structure and interspecific introgressive hybridization between Camellia meiocarpa and C. oleifera. The Formation and Differentiation of the Diversity of Malus toringoidesHughes. The Formation and Differentiation of the Diversity of Malus toringoidesHughes. STUDY ON THE INTROGRESSIVE HYBRIDIZATION BETWEEN PINUS HWANGSHANENSIS AND P.MASSONIANA Introgressive Hybridization between the Synthetic Allotetraploid in Cucumis and Cultivated Cucumber and Assessment of the Genetic Variation in theProgenies