Review concerns questions of reproductive biology, the field of biology that relates to such fundamental items as sexual reproduction, life cycles, breeding systems, rules of sex determination and inheritance. Tendencies of reproductive biology are discussed in chronological order. Unresolved problems are accentuated. The role of reproductive biology methods combined with the methods of molecular biology is emphasised. Publications over the last 150 years are analysed.

Keywords: Bacillariophyta, reproductive biology, sexual reproduction

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