Morgan was a supporter of de Vries's mutation theory and was hoping to gather evidence in favor of it when he started working with the fruit fly Drosophila melanogaster in his lab in 1907.
12.
The mutation theory of evolution held that species went through periods of rapid mutation, possibly as a result of environmental stress, that could produce multiple mutations, and in some cases completely new species, in a single generation.
13.
In 1953, in a paper published in the " British Journal of Cancer ", he first proposed the multi-mutation theory on cancer, today generally known as " Knudson hypothesis " after Alfred G . Knudson's work from 1971.
14.
DeVries's ideas were very influential in the first two decades of the 20th century as some felt mutation theory could explain the sudden emergence of new forms in the fossil record and research on " Oenothera " spread all over the world.
15.
He also most certainly had read, apart from Darwin, Haeckel, from whom he retained his idea of a unity of life and of the ecological solidarity between all living beings, as well as Hugo de Vries, from whom he quoted his mutation theory of evolution ( which he opposed, preferring Darwin's gradualism ).
16.
Among these theories were neo-Lamarckism ( which merged certain aspects of Lamarck's theory of acquired characteristics with certain aspects of Darwinian evolution ), orthogenesis ( " straight-line " evolution, which talked about evolution towards a specific goal by forces within the organism ), and the discontinuous variation of Mendelism and Hugo De Vries'mutation theory.
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