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Updated: May 18, 2026

Microscopy of Fission Yeast Sexual Lifecycle
Published on: March 9, 2016
Have sex or not? Lessons from bacteria
1Université de Rennes 1, Campus de Beaulieu, Rennes, France. thierry.lode@univ-rennes1.fr
Abstract:
Sex is one of the greatest puzzles in evolutionary biology. A true meiotic process occurs only in eukaryotes, while in bacteria, gene transcription is fragmentary, so asexual reproduction in this case really means clonal reproduction. Sex could stem from a signal that leads to increased reproductive output of all interacting individuals and could be understood as a secondary consequence of primitive metabolic reactions. Meiotic sex evolved in proto-eukaryotes to solve a problem that bacteria did not have, namely a large amount of DNA material, occurring in an archaic step of proto-cell formation and genetic exchanges. Rather than providing selective advantages through reproduction, sex could be thought of as a series of separate events which combines step-by-step some very weak benefits of recombination, meiosis, gametogenesis and syngamy.
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