sexual offspring produced by the crossing of two genotypically different organisms. The organisms crossed are called parental forms and are designated by the letter P. The maternal form or female individual is designated by the symbol ♀ , the paternal form or male individual by the symbol ♂, crossing by the symbol ×, hybrid offspring of the first generation by F with the subscript 1 (F1), second generation by F2, and so forth. For example, the F4 hybrid of ♀(beardless wheat) Bezostaia 1 × ♂ Belotserkovskaia 198 is the fourth generation of the hybrid in which the maternal form was Bezostaia 1 and the paternal form Belotserkovskaia 198. Hybrids may be spontaneous or artificial, intraspecific or remote. The following hybrids are distinguished in breeding corn: the intervarietal, when two varieties are crossed; the variety-line hybrid, when a variety is crossed with an inbred line (for example, to produce the hybrid Bukovinskii 3: ♀ Gloriia lanetskogo × ♂ VIR 44); the single cross hybrid, from the crossing of two strains (for example, the hybrid Slava is produced by crossing the inbred lines ♀ VIR 44 ×♂ VIR 38); and the double cross hybrid from crossing two simple hybrids (for example, the hybrid VIR 42 is produced by crossing ♀ Slava × ♂ Svetoch).
D. M. SHCHERBINA