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Please research the article's assertions. Whatever is credible should be sourced, and what is not should be removed. </p> </td></tr></tbody></table> <table class="infobox" cellpadding="1" cellspacing="0" style="float: right; margin: 0 0 0.5em 0.5em; text-align:left; border: 1px solid #5959DA; width:175px;"> <tbody><tr> <td style="font-size: 95%; text-align:center; color:White; background-color:#5959DA"><b>We're all Homo here</b><br /><a href="/wiki/Evolution" title="Evolution"><font size="5" color="White"><b>Evolution</b></font></a> </td></tr> <tr> <td style="background-color:#E0E0F0;" align="center"><a href="/wiki/Category:Evolution" title="Category:Evolution"><img alt="Icon evolution.svg" src="/w/images/thumb/5/5c/Icon_evolution.svg/100px-Icon_evolution.svg.png" decoding="async" width="100" height="100" srcset="/w/images/thumb/5/5c/Icon_evolution.svg/150px-Icon_evolution.svg.png 1.5x, /w/images/thumb/5/5c/Icon_evolution.svg/200px-Icon_evolution.svg.png 2x" data-file-width="200" data-file-height="200" /></a> </td></tr> <tr> <td style="font-size: 95%; color:White; background-color:#5959DA; text-align:center;"><b>Relevant Hominids</b> </td></tr> <tr> <td style="font-size: 95%; background-color:#E0E0F0;"> <ul><li><a href="/wiki/Charles_Darwin" title="Charles Darwin">Charles Darwin</a></li> <li><a href="/wiki/Alfred_Russel_Wallace" title="Alfred Russel Wallace">Alfred Russel Wallace</a></li> <li><a href="/wiki/Gregor_Mendel" title="Gregor Mendel">Gregor Mendel</a></li> <li><a href="/wiki/Richard_Dawkins" title="Richard Dawkins">Richard Dawkins</a></li> <li><a href="/wiki/Jerry_Coyne" title="Jerry Coyne">Jerry Coyne</a></li></ul> </td></tr> <tr> <td style="font-size: 95%; color:White; background-color:#5959DA; text-align:center;"><b>A Gradual Science</b> </td></tr> <tr> <td style="font-size: 95%; background-color:#E0E0F0;"> <ul><li><a href="/wiki/Darwinism" title="Darwinism">Darwinism</a></li> <li><a href="/wiki/Indohyus" title="Indohyus">Indohyus</a></li> <li><a href="/wiki/Synapsid" title="Synapsid">Synapsid</a></li> <li><a href="/wiki/Cataclysmic_evolution" title="Cataclysmic evolution">Cataclysmic evolution</a></li></ul> </td></tr> <tr> <td style="font-size: 95%; color:White; background-color:#5959DA; text-align:center;"><b>Plain Monkey Business</b> </td></tr> <tr> <td style="font-size: 95%; background-color:#E0E0F0;"> <ul><li><a href="/wiki/Young_Earth_Creationism" class="mw-redirect" title="Young Earth Creationism">Young Earth Creationism</a></li> <li><a href="/wiki/Old_Earth_Creationism" class="mw-redirect" title="Old Earth Creationism">Old Earth Creationism</a></li> <li><a href="/wiki/Intelligent_Design" class="mw-redirect" title="Intelligent Design">Intelligent Design</a></li> <li><a href="/wiki/Microevolution" class="mw-redirect" title="Microevolution">Microevolution</a> vs. <a href="/wiki/Macroevolution" class="mw-redirect" title="Macroevolution">Macroevolution</a></li></ul> <div class="vte plainlinks" style="font-size:smaller; text-align:center;"><a href="/wiki/Template:Evolution" title="Template:Evolution">v</a> - <a href="/wiki/Template_talk:Evolution" title="Template talk:Evolution">t</a> - <a rel="nofollow" class="external text" href="https://rationalwiki.org/w/index.php?title=Template:Evolution&action=edit">e</a></div> </td></tr></tbody></table> <p><b>Gene flow</b>, also known as <b>gene migration</b>, occurs when <a href="/wiki/Allele" title="Allele">alleles</a> migrate or flow between one population to another. This is a mechanism by which new variants can be added to otherwise limited gene pools. Gene flow can decrease overall genetic diversity and variation between two separated populations (the primary means by which <a href="/wiki/Speciation" class="mw-redirect" title="Speciation">speciation</a> can occur), but it can act as a mechanism for evolutionary change. </p><p>Gene flow is common in plants that fertilise by pollen, which is spread long distances via wind, animals or insects. Barriers that prevent these mechanisms from occurring can limit gene flow and contribute to the separation of populations, increasing their genetic diversity. For example, some species of plants either side of the Great Wall of China are shown to have increased genetic variation because gene flow between them is impeded by the wall. Other plant species that primarily pollinate by the wind exhibit less variation as the Great Wall doesn't act as much of a barrier for that mechanism. </p> <h2><span class="mw-headline" id="Gene_flow_in_humans">Gene flow in humans</span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Gene_flow&action=edit&section=1" title="Edit section: Gene flow in humans">edit</a><span class="mw-editsection-bracket">]</span></span></h2> <p>Gene flow in humans occurs when someone with differing genes breeds into a population. This leads to their genes being added to the collective gene pool. </p> <div role="note" class="plainlinks stubtemplate" style="margin:auto; text-align:center; background-color: #f9f9f9; padding: .5em; border: 1px solid #aaa; width: 300px; font-style:italic;">This <a href="/wiki/Category:Evolution" title="Category:Evolution">evolution</a>-related article is a <b>stub</b>.<br />You can help RationalWiki by <a rel="nofollow" class="external text" href="https://rationalwiki.org/w/index.php?title=Gene_flow&action=edit"><b>expanding it</b></a>. </div>    </div></div><div class="printfooter">Retrieved from "<a dir="ltr" href="https://rationalwiki.org/w/index.php?title=Gene_flow&oldid=2020503">https://rationalwiki.org/w/index.php?title=Gene_flow&oldid=2020503</a>"</div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Special:Categories" title="Special:Categories">Categories</a>: <ul><li><a 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