Editing Natural selection (section)

===Cell and molecular biology===

In 1881, the embryologist [[Wilhelm Roux]] published ''Der Kampf der Theile im Organismus'' (''The Struggle of Parts in the Organism'') in which he suggested that the development of an organism results from a Darwinian competition between the parts of the embryo, occurring at all levels, from molecules to organs.<ref>{{harvnb|Roux|1881}}</ref> In recent years, a modern version of this theory has been proposed by [[:fr:Jean-Jacques Kupiec|Jean-Jacques Kupiec]]. According to this cellular Darwinism, [[stochastic|random variation]] at the molecular level generates diversity in cell types whereas cell interactions impose a characteristic order on the developing embryo.<ref>{{cite web |url=http://www.scitopics.com/Cellular_Darwinism_stochastic_gene_expression_in_cell_differentiation_and_embryo_development.html |title=Cellular Darwinism (stochastic gene expression in cell differentiation and embryo development) |last=Kupiec |first=Jean-Jacques |author-link=:fr:Jean-Jacques Kupiec |date=3 May 2010 |website=SciTopics |archive-url=https://web.archive.org/web/20100804050452/http://www.scitopics.com/Cellular_Darwinism_stochastic_gene_expression_in_cell_differentiation_and_embryo_development.html |archive-date=4 August 2010 |access-date=11 August 2015}}</ref>