XX.3.6.1 The definition of a species based on phenotypic cohesion also encompasses the definition of biological species and the definition of species based on intraspecific recognition

It is apparent that, in a sexually reproducing species, the exchange of genetic information between members of the population, occurring during sexual reproduction, functions as a mechanism capable of maintaining mutual similarity of the members of the population.In other cases, cohesion is ensured by the existence of a common species-specific mechanism of recognition of sexual partners.Thus, the cohesion species concept encompasses the  biological species concept and also the ethological species concept.

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The classical Darwinian theory of evolution can explain the evolution of adaptive traits only in asexual organisms. The frozen plasticity theory is much more general: It can also explain the origin and evolution of adaptive traits in both asexual and sexual organisms Read more
Draft translation from: Evoluční biologie, 2. vydání (Evolutionary biology, 2nd edition), J. Flegr, Academia Prague 2009. The translation was not done by biologist, therefore any suggestion concerning proper scientific terminology and language usage are highly welcomed. You can send your comments to flegratcesnet [dot] cz. Thank you.