There were various evolutionary theories, many went forward and could be corroborated by other evidence or lack of being totally irrational fell by the wayside.
The leading theories are those of Lamarck, Darwin and Wallaceand neo-Darwinism, but besides these were made not so known.
* Mutation: Abandoned after the appearance of the synthetic theory, theMutation considered that mutations were the only bikes of change and the origin of species.
* Neutralism: Consider that most mutations are neutral, neither favorable norunfavorable, that is, do not translate into advantages ordisadvantages for individuals of populations. The changes should be primarily the spontaneous reproduction favored the survival of certain genes in populations.
* Neo-Lamarckism: While never able to prove the inheritance of acquired carcteres, there is some inclination to believe that the origin of the changes weeither randomly, if the mutation is, in a moso, determined by the medium.
* Balances interrupted: Considers that the sudden appearance of new species in the fossil record and the characteristics of large groups is due to "geneticrevolutions" or breaks that interrupt the normal process ofadaptation by natural selection.