Changes

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[[Image:lighterstill.jpg]] [[Image:Darwin_tree_4.jpg|right|frame|<center>[[Darwin|Darwin's]]</center><center> [[Tree of Life]]</center>]]

[[Image:Darwin_tree_4.jpg|right|frame|<center>[[Darwin|Darwin's]]</center><center> [[Tree of Life]]</center>]]

In [[biology]], '''evolution''' is the change in the [[heritability|inherited]] [[trait (biology)|traits]] of a [[population]] from generation to generation. These traits are the [[gene expression|expression]] of [[gene]]s that are copied and passed on to offspring during [[biological reproduction|reproduction]]. [[Mutation]]s in these genes can produce new or altered traits, resulting in heritable differences ([[genetic variation]]) between organisms. New traits can also come from transfer of genes between populations, as in [[migration]], or between species, in [[horizontal gene transfer]]. Evolution occurs when these heritable differences become more common or rare in a population, either non-randomly through [[natural selection]] or randomly through [[genetic drift]].

In [[biology]], '''evolution''' is the change in the [[heritability|inherited]] [[trait (biology)|traits]] of a [[population]] from generation to generation. These traits are the [[gene expression|expression]] of [[gene]]s that are copied and passed on to offspring during [[biological reproduction|reproduction]]. [[Mutation]]s in these genes can produce new or altered traits, resulting in heritable differences ([[genetic variation]]) between organisms. New traits can also come from transfer of genes between populations, as in [[migration]], or between species, in [[horizontal gene transfer]]. Evolution occurs when these heritable differences become more common or rare in a population, either non-randomly through [[natural selection]] or randomly through [[genetic drift]].