In Vitro Androgenesis: Events Preceding Its Cytological Manifestation -- Doubled Haploids: A Powerful Biotechnological Tool for Genetic Enhancement in Oilseed Brassicas -- Double Fertilisation in vitro and Transgene Technology -- Polymorphism of Sexual and Somatic Embryos as Manifestation of Their Developmental Parallelism under Natural Conditions and in Tissue Culture -- Molecular Biology and …